Rev It was a sponsor of the series that we used to run (USGPRU)...they make good quality stuff from what we have seen.
I can't, however, give you a "personal" experience, as I haven't worn their gear. I know a couple of people who wear their one-piece suits and like them, but I don't know if they crash well, how ventilated they are, how heavy they are, etc...I have not heard anything bad about their products, though, which is a good thing considering how much we are at the track.
Laura