I wonder how the new Razer Hammerhead will sound http://www.razerzone.com/gaming-audio/razer-hammerhead/ It's funny how much time they've spent explaining about tips and isolation though. I still remember their first iem the Razer Moray, which was pretty bad but it was some years ago, so they might have improved on that front.
Most reviews I've read(surprisingly plentiful seeing as how they have just been released) seem to say the same thing. Bass heavy, good overall sound, but there are others who perform just as well(if not better) for a cheaper price.
Also that the "pro" version with a mic makes them slightly veiled/muffled.