tried oppo pm-3 (when was auditioning hd800, all audeze stuff, gs1000e, he-560, he-400i), imho nothing special, actually didn't like it at all, especially midrange completely uninvolving, sounded dead to me, regarding its price I would not even consider buying it, but it's all about preferences and hearing (if u really want cheap planar just go with old he-400 instead), maybe pm-1 is much better - haven't auditioned it yet but the price is really high, I would rather go with hd800 knowing my preferences
also compared directly lower denons like 300 and 200 but they are in completely different league, also tried some active monster (sounded a bit like he-500 for 1/3 price)