I just want to say, thanks guys!
These things are reeally good. When I first listened to them, it was like "Yeah, ok, they sound better than my old earphones". After that, in the subway, was "Well, this is good" but, when I was on my bed at the night, I couldn't stop listening to them, it was amazing! Every song that I enjoyed before was way better now, and I had shivers everytime. Not sure if this is a reference pair or something because some songs sound pretty bass heavy, but others sounds normal so, who knows, but I'm really enjoying them!
Fit is a bit weird because if you push them a bit too far, they make a vacuum on your ears that could be even painful, so, yes, they work better with a relaxed, slightly shallow fit. Isolation is really good, and well, overall, everything sounds right. Bass, mids, highs, detail, soundstage, layering..everything is there, and good. Also, I didn't found them power-hungry, I use them with my Cowon D3 at half of volume usually, or slightly higher than that.
TL;DR Awesome earphones!