Only put about 100 rounds through it, but so far am very impressed. Used PMC 5.56 x-tac.
This is my first ar style rifle I've owned. I was definitely attracted to the fact it was under 1000 dollars and was an aluminum upper and lower. I also really like how it is not completely filled with rails. But there is still enough for you to do a fore grip, laser, flashlight, and scope, assuming none of them are combos.
I was told that Diamondback is from some guys from Kel-Tec, which I was at first skeptical, but got over it pretty quick.