RPB Safety Z-Link Respirator with PX5 PAPR - Neck Seal

I have had the z4 for about 10 months or so and use it often. This is my first helmet of this type so I only have this unit to go off of. I use it for grinding, sanding and welding. Overall I am pleased, with a couple of exceptions. 1- If I could purchase again, I think I would go with the Z-link, primarily because the entire front appears to flip upso that you can take a drink of water or wipe away sweat without having to completely pull off the good. 2- After a couple of hours, I do find that it gets a bit front heavy and causes a headache so I have to remove it. 3- I have a scratch on thr clear lens from a grinding incident and I simply cannot find where to get a replacement lens. I would buy it again, however knowing what I do now, I would look at other options a little closer before spending the cash.