Sorry, been in Colorado for the last two weeks with no internet access.
I really like mine so far (about 750rds.) I brought my Armalite with me out to CO. there is a public shooting range about 1 mile down the road from my fathers house, and I put it to use. It never came loose and held its zero perfectly from what I could tell. It also seems very light to me, much lighter than my old Aimpoint QR mount that it replaced.
If you do decide to pick one up from botach, make sure to tell them to double check what they are sending you. I ordered two separate items from them in the past, and both times they screwed it up. I ordered the Low profile B&T Aimpoint mount, but they sent me the Medium mount. It worked out perfect for my Mid-length/Bi-level S.I.R. mounted just in front of the upper level rail. I originally wanted the Low mount for my 10.25" upper with a Knights RAS II and I plan on ordering another one this week. Hopefully they(botach) will send me the right one this time. I'm gonna call DSA arms also, they have alot of B&T stuff offered on their web site. I will try and post some pics of it mounted on my 16" S.I.R. upper if hunt101 is working.