Sound: Good, very lively sound presentation - Fun to listen to. Fine to listen to out of almost any source, as they're driven quite easily. Strong bass, engaging (some even say sparkly) highs - I like their sound signature a lot.
Comfort: Noticeable clamping force out of the box, headband mod may or not be required. Pads get warm on your ear after a while, especially in warm areas. Comfort in general isn't the greatest, but I got used to it pretty quick - I can wear mine for hours no problem.
Isolation is below average - Strangely enough, they seem to amplify certain outside noises and block out others. I personally would like as much isolation as possible with closed cans, so this is a con for me, especially with the ES7 being a portable. Sound leakage is about average. Not exactly library/study hall spec, but you won't disturb anyone on a train/bus too much with them, even with the volume up.
Overall: A great portable phone - Recommended. They sound good, they look good (black shiny cups might be a bit too bling for some, but look very slick in my opinion). I like 'em so much, I'm considering the ESW10. Just watch out for all the fakes floating around...