Heard these with Chord Hugo and boy oh boy was I unimpressed...  These are not worth anywhere their price point where their sound is concerned.  Decently comfortable though.  
 
The sound signature is just not pleasant, it's not very detailed or musical, just too dark and there was definitely something weird going on with the bass; rather overwhelming and kinda unnatural sounding, couldn't get passed it, anyway, it's way too expensive for its performance IMHO...  Even at half the price it would have serious competition, at full price there's no reason not to pickup a better sounding headphone...   I just really didn't dig these audioquest headphones...
 
I guess YMMV, as per comments below and other reviews, many seem to enjoy them...  Personally,  Hifiman 400i imho easily takes the cake at ~300$ less (650 vs 350 cdn$).  Even AKG Q701 have much better tonal balance, I think they may even just plainly be just a better headphone...   My advice would be definitely audition and compare them to other headphones, definitely not ordering blind...