It gets an 80% thumbs up at AR15.com
My Rock River Arms has failure to extract problems with it after the gun heats up, my buddies Bushmaster M4gery eats the stuff up and never chokes on it.
GoRon,
There's a long thread on AR15 where they helped a fellow in Iraq with an extraction problem. There's a rubber washer you install in the bolt and then insert the spring and extractor. It's supposed to help a lot.
Does anyone have any experience with shooting it?