I've got a quantum, that's Matrix, P1600, 800w ch poweramp. A Quantum, again Matrix, T800, 400w ch poweramp and a Phonic Max 1600, 450w ch poweramp, I'm selling these but haven't advertised them yet. PM me if you're interested. They all work as they should and have been totally reliable.
DR280s, doesn't get a lot better than that. The above amps powered a pair of T39s and a pair of Otop 12s run 3 way.