i own a couple of them, and between family and friends we probably have 10 right now in various calibers - 450 bushmaster, 223, 9mm, 350 legend, 458 socom.
for the price, its hard to beat. that said - sometimes a QC issue gets by, but their CS dept makes it right.
for example.. cousin bought a 223 side charger. when it arrived the screw that holds the bolt in at the rear of the receiver was bent. you could not install it on an upper because of its shape (its flat on one side to rest on the buffer tube loop) we're talking like a 3/8" thumb screw. so it had to have been dropped at the factory and then packed that way. two emails, a picture and he had a shipping label. the replacement upper arrived about 12 days after he sent his back to them.