The RZ mask is very comfortable, but at least in my opinion, it's difficult to breathe. I found myself not wearing it as often as I should. Saw these new valves and rolled the dice, hoping they were better. Yes...they are. WAY better.
I bought after market filters and caps and for awhile hated my RZ mask. I’ve never thought it was as comfortable as others claim, but once I went back to original filters I instantly noticed they were better. Way way way way better. I no longer hated It. Then I upgraded the valves and again, way better. Better air flow. Better fog direction etc. I bought them because I needed to spend another $10 for free shipping, but I’d happily buy them again if needed.