Ok now i guess it's my turn to give my impressions about the 7XX's since i've been using them a few days now
I'm not an audiophile in any way, but i'll try to give an average, standard consumer point of view
Here is my gear : Flac files and up / FiiO X3 2nd generation
Other headphones : Sennheiser momentum 2.0 ; Sennheiser HD598 SE
* Build : not the sturdiest ever, for sure, but also not the cheapest. They are heavier than what I expected...