Well, personally I don't seem to have too many problems with them. While my favorite units are the Hughes units, the RCA's, IMHO run a close second - they actually have many similarities. Also, the RCA IS the only UHF D* being made, so that sometimes will influence one's decision on choice of receiver. I don't care too much for the interface on the Phillips or Samsung units. (non-DVR receivers,of course)
But, I have not overall installed as many as many dealers have. I will say that on Claude's board, there are several that dislike them as well, from a reliability standpoint. And, I did have a rash of DRD505 3rd gen receivers that all of a sudden started pixelating & freezing up. The customers just ended up buying new units anyway, so it was not that big of deal. But, these newer units all seem to be more reliable than previous ones, so I would not be conerned about getting one of these newest units - I'd take a gamble on these anyday over some of the junky E* receivers being sold these days.