DPMS is local for me. I bought my first AR from them - a 24" fluted stainless bull used for target/varmint activities. I have had zero malfs with it, and have run almost 2k rounds through it, including a few handloads that were right at the top end of sane.
That being said - I have seen other folks have issues, ranging from the petty to the kaboom. The first thing I do with any new firearm is strip it down, check and remove burrs/rough edges/etc., scrub everything with a brass brush and CLP, wipe it all down with more CLP, and reassemble. That's also my SOP for cleaning. Maybe I got lucky with mine, maybe I'm just anal enough that bad things haven't happened, but as soon as I decide if I want a 6.8 or a 243 I will be purchasing from DPMS.