Segway Navimow i105N Robot Lawn Mower Perimeter Wire Free 1/8 Acre RTK+Vision Robotic Lawnmower, AI-Assisted Mapping, Virtual Boundary, APP Control, 58dB(A) Quiet, Multi-Zone Management

Summary: After a few weeks, while not perfect (still working out a few kinks), I'm giving this 5 stars because it is very impressive and I am very optimistic that it will reach near full independence. For yard situations like mine or simpler, I would definitely recommend it.Value: I have a ~7500sqft (0.17 acre) yard. I paid over $1k for mowing in the last year, and that is definitely on the lower end of what I could have paid. Including accessories I had to procure (mountable antenna, and traction wheels, see below), I'm sure this will pay for itself in 2 years, which is before the 3 year warranty expires. I do need to use a string trimmer on a majority of the edges of my yard and a few islands, but that will only take ~12 minutes every week or two.Installation/setup: It's definitely very picky about where to place the antenna and station, but I found the antenna to be more picky. I strongly recommend the antenna mounting kit, or a DIY solution. The station wasn't happy for me under a small eave so I had to rethink where I wanted it, but it's working well on the south side of my house, touching the wall, with a pretty good view of the south. The app is pretty good and setup is pretty easy.Reliability: My yard is mostly very flat, with a few protruding roots, small slopes/crevices, and storm drains. I had to configure no-go zones for my roots but not a big issue, can trim afterward. My slopes, especially around the storm drains, definitely push the limits of the stock wheels. It mostly can recover smartly and still get the job done, but it slows it down considerable. I 3D printed some better traction wheels (can find models online) and that seems to largely fix the slope issues in my case. You could also buy the $100 traction wheels if you don't have access to a suitable 3D printer. It can get stuck in small crevices/dips in the yard, so you may need to put down a bit (like an inch) of dirt in a few areas to prevent that. I still haven't gotten it to do my entire yard without getting stuck, but I'm getting really close. It got 98% done yesterday and then got stuck on the curb twice, probably because I configured that edge to be a ride-on boundary. I think if I remap that zone to not be ride-on, it should be fine. It did trample over one of my plants slightly outside the boundary once, but it hasn't done that again. There wasn't an obvious transition from yard to bed so it probably thought it was just more yard. It can do my entire yard in one day during daylight, with an hour or two to spare, so a full quarter acre is likely pushing it for a single day unless you enable night mowing. But no reason it can't be done in two days.Performance: The yard looks quite nice when it's done, I like the small light tracks it leaves much more than big riding lawnmower tracks. It occasionally misses small portions of grass, but I have it doing the whole yard twice a week so it shouldn't be very noticeable. This lawnmower allows the grass to be cut much more frequently, which means smaller clippings, which is healthier for the grass and looks better too.

EXTRA TIP: If you want to mount your antenna on top of a flat surface, and you don't need an extension cord, and you don't want to pay $50 for the official antenna extension kit, try searching Amazon for 'Light Wall and Ceiling Mount with 5/8" Stud and 1/4" Thread'. I happened to already have this item sitting around, and it fits the threads on the antenna perfectly. The only caveat is the that the square shape of the antenna doesn't align with the square base of the mount when fully screwed on. Just cosmetic issue, and in my case you can't even see the antenna without climbing a ladder.UPDATE 2: I am pretty well delighted with this product now. As I mentioned before, Navimow support recommended diabling camera-assisted positioning after my map deleted itself. But I decided to try mapping my yard one more time without disabling that feature, and this time it worked fine! The mower is doing a fantastic job of navigating my yard and I'm so happy I don't have to spend my weekends mowing anymore. There are just a couple of spots where it has trouble due to sloping/uneven ground, but Navimow support is also sending me a couple of free accessories as an apology for the bumpy experience I had initially. Hopefully the off-road tires will improve the unit's traction, but even if I have to hit those two spots manually with the weed whacker, that's not a big deal.I can also confirm that I've been able to map more than 600 square meters of lawn area on the i105N, so it seems they really did raise its map area limit to be the same as the i110N. A very welcome upgrade.I have a theory about what caused my map to disappear the first time. I could be completely wrong, but just in case it's helpful to anyone... When I was setting up the last couple of boundaries right before the map disappeared, I took some fairly long pauses to clear away debris from the edges of the lawn. I'm thinking maybe the camera-assisted positioning video keeps recording even when you aren't moving the unit, and so I ended up with some massive video files, and their sheer size caused the glitch that deleted my map. Sooo, if you want to be on the safe side, maybe try to make sure you get any prep work put of the way before you start mapping a boundary.Overall I think this is clearly the best value among GPS robo-mowers for anyone with a relatively small yard, especially now that it seems to support up to 1200 square meters of grass. If your lawn is closer to the upper end of that range, you might want to consider the i110N, which is still an excellent value compared to most other GPS mowers on the market. But even this i105N seems like it would have no problem covering that area as long as you don't mind it doing so over the course of two or three days.---UPDATE 1: I've exchanged several emails with Navimow support now. They did a much better job of understanding my problem after that first reply. Unfortunately, they are unable to recover my map, and they have suggested that I try disabling camera-assisted positioning and re-mapping my yard. They seem to think there might be a hardware issue with my particular unit that is causing it to lose the map when processing the camera data. However, they have offered to compensate me for this frustration in a number of possible ways, including free accessories, and/or replacing my unit with an upgraded model to better accommodate the size of my yard. They also informed me that the coverage limit on the i105N (all units, not just mine) has been upgraded to 1200 square meters, the same as the i110N, which is very much appreciated.I've agreed to spend some more time testing my unit to see if disabling camera-assisted positioning fixes the disappearing map issue, and whether the unit is able to navigate my yard without that feature. (I'm somewhat doubtful, because my yard does have some areas with tree coverage, etc.) Then I will report back to support with the results and let them know what sort of compensation would be most helpful. This is all just theoretical for now, so I'm not changing my rating yet, but I will make sure to keep updating this review as the situation progresses.---INITIAL REVIEW: I'm still holding out hope that this will work out for me, but the experience so far has been rough. Basic installation was relatively straightforward, although I find it irritating that a wall/roof mount for the antenna is a separate purchase, because that's clearly going to be the best option for most people. The real trouble started when I was mapping out my yard.First, I was a couple hours into the process when I decided to set up a "channel" from my lawn back to the dock. This is a requirement if the dock isn't within the mowing area itself. The app briefly and casually instructed me to drive the mower from the mowing area to the front of the dock. However, I drove the mower all the way onto the dock, and it immediately went into charging mode, which apparently deletes any unsaved map changes. So I lost everything I had done up to that point. I was steaming mad, but there was nothing to be done except start over. Seems incredibly silly to just delete the unsaved map without asking, and even sillier to not warn the user about this when explicitly instructing them to drive the mower to the dock during a mapping session.So I started over and eventually mapped out my whole property over the course of a couple days, pausing freauently this time to save my changes. Now, whenever you add a new mowing area to your map and then end the mapping session, the mower asks to return to the dock and process the "VisionFence" data it gathered during the mapping. So after my final edits, I allowed this to happen, and the mower spent the next hour or so processing the data. Well, when I came back and checked the app, my map was completely gone. No sign I ever even started one. Absolutely incredible.This time I reached out to Segway support via chat, and after some brief troubleshooting steps the agent informed me my ticket was being escalated and I should hear back via email within two days. I did not get any kind of automated email confirming that a ticket had been created, but another agent confirned this the following day. Today, two days later, I did get an email response, but it was completely unhelpful, offering instructions on how to get the map to save (which isn't the problem I'm having).In the meantime, I doscovered that after reinstalling the app, my map shows up again, but it disappears as soon as I pair the app with the mower. So I am hopeful that my map still exists somewhere and can be restored by tech support. I replied to the email with a screen recording of this and another explanation of my problem. Now I am waiting again. I will update this review as the situation progresses.The other extremely irritating aspect of this product is the arbitrary, software-imposed limitation on the area that can be mapped out for mowing. I did my best to estimate the size of my actual grass areas before ordering this model, but it appears I was off by a significant amount, so even if my map does get restored I might have to return the unit and order the 1/4 acre version for $300 more. No clue if I'll be able to transfer my map or if that will mean starting from scratch yet again. I get that they want to encourage people to buy the more expensive model, but they should allow the larger battery to speak for itself instead of imposing artificial limitations. This is only going to result in lots of mowers being returned when people discover they have more grass than they thought.Aside from all my complaints, I can say that the mower did work beautifully during the brief time I was able to test it out on part of my yard. There's a small section with an overhanging carport that seems to cause trouble with GPS reception, and for whatever reason the VisionFence is unable to compensate in that spot, but overall it shows a lot of promise. I'm still clinging to hope that these issues will be resolved and I'll finally be free from spending half of every weekend cutting grass.