My wife and I got respro techno masks for last year (and they were indeed overkill for last years conditions). My wifes was great, I however turn out to need an extra large, which they only make in one style and that i would need to order from england (and it costs 33 pounds) So i got a RZ mask for this year which i have yet to actually use, but i can make some comments. The RZ mask seems noticeably cheaper, the material is thinner and the breathing valve is not as nice (the rz mask is much cheaper, the respro I needed is 1.5 times the rz mask I got). The RZ mask doesn't seem flimsy though, it's that the respro seems particularly tough.The RZ mask stank of outgassing plastic when I got it, 2 weeks later and it now smells the same as the respro, so if you're going RZ get that order in soon. Respro offers a combination chemical/dust filter which could be nice if you're stuck down wind of something nasty burning, and would make the respro more useful outside of burning man. RZ offers a lot more colors/styles, which could be nice if you wanted to get crazy and match masks to outfits.