Well i have been playing my Denon ah-d2000 and FiiO e17 for a fortnight now with some surprising results.
Using usb from a cheap 16 bit notebook the SQ is great. Amazing clarity and what sub bass you get from these. Makes my brain rattle.
Using optical with a ps3 isnt so impressive. I keep hearing a distorted grainy sound. I was expecting it to be the other way round to be honest. These phones are fun though and worth the £200 i paid and im really impressed with the FiiO. A very warm sound for a digi component and very versatile with plenty of headroom.