I've sold about half a dozen DPMS rifles to guys (and gals) in our local club and never had a complaint. I own one DPMS rifle myself and am very seriously satisfied with it(Panther classic w/ 16" regular profile bbl, flattop, JP trigger, AK-74 style muzzle brake). It will shoot 3/4 MOA with Federal 62 gr. red box cheap stuff, 1/2MOA with Federal Gold Medal Match HPs. I have a DPMS DCM (CMP) upper on order for myself. It has all the regular CMP goodies (stainless hvy bbl, free float tube, match front and rear sights) for about $150 less than anybody else that I can get a quote from will sell a similar upper for.
DPMS can be slow to ship but they have always given me an honest estimate of when they can deliver the product. They also have, without exception, shipped rifles sooner than promised. Their customer service folks are friendly, knowledgeable, and helpful.
The AR15.com 2002 LEGP rifle is a DPMS. That's a pretty strong statement in favor of their products in my book.