Highly doubt you'll be dissapointed. Just ran my PSA upper through the ringer just the past holiday 800rounds in one day! Was put on a FA lower. Not my ammo of course, and I didn't shoot the full auto. Solidified my confidence in this upper.
Heck, if I didn't have to get 8 new tires for my two Subaru's...I'd go get the Colt right now. Tires are more important in my current life style than ANOTHER firearm......Agghh, wife coming out through me.