I heard the HE-90 at a recent meet, but only long enough to get a quick impression (true of most of what I listened to, which included the Senn HD580, 600, Stax SR007, HP-1000 and others). My first impression was of awesome front-to-back imaging... it clearly sounded like certain instruments were way back on the stage, and others were right up front playing near me (and everywhere in between, of course). The illusion was more realistic than anything I've heard yet through a pair of headphones. This was through one of zzz's electrostatic amps.
Could be that some of it was due to zzz's amp, of course... strictly speaking this wasn't an Orpheus system. Anyway I wouldn't take any audio reviewer at face value, IMHO they can get a bit overzealous about stuff they like.