Anyway here is my 'review': I am using Sennheiser HD595 - the E10 jack socket has some problems with the big bulky 6.3 -> 3.5 jack adapter on my headphones cable. It is not plugged in straight, but is kinda askew. When I touch the jack adapter or try to switch the bass boost I get crackles immediately :/ Not that bad, because I use E10 for desktop PC so I do not need to touch it often, but still sucks, since it is doing this from the arrival...
About the sound - it may be a little subjective, but: before E10 I was using an old Sound Blaster Live! Gold (all jacks + electrical paths are golden). I was using the old (1998) soundcard, because I though it was still somewhat better then the onboard Realtek. Personally I would say the E10 is a great upgrade - it gives my HD595 really much bigger soundstage, the bass is also better. I do not consider myself an audiophile, and haven't been doing A/B tests between the SB and E10, but the E10 sounds definitely better, even from the first listening.
One strange thing though: when I first plugged the E10, I set the 'Default format' tab settings in Windows 7 to 2 channel, 24 bit, 96000 Hz
I had my Windows volume somewhere around minimum to middle and was getting some random pops and cracks when playing music (like listening to an old vinyl record) - it was pretty annoying and I was afraid I would have to go through the RMA process with MP4 Nation. Try it yourself, I later found out, that it is most noticeable here (set the sound settings as described above): http://en.wikipedia.org/wiki/File:Gogobeat.ogg. Notice even the fade-in between the beats. The pops get a little bit better, when you set max volume in Windows and use the volume knob on E10.
I ended up with setting 2 channel, 16 bit, 44100 Hz, this gives me no crackles nor pops in music, whatever Win volume I use. Only the pops when you pause/stop music playback (which are still sort of annoying when playing games or windows sounds).
One last question to end this long post: Did anyone try to open the E10? I am thinking of resoldering the jack when it eventually breaks, instead of RMA...
Thanks everyone in this thread for valuale info, in general I don't regret getting E10 at all
Edited by smrky - 5/1/12 at 2:16am