I bought a pair of these just for travelling with, and I'm so impressed.. I can only compare (in terms of IEM'S) to my IE8's but I find the shure sound clean and the instruments are seperated and presented really well. They're a real all rounder sounding great with all genres and are comfortable to boot. The really brilliance of these is their durablilty, they've been absolutley smashed in my backpack, rained on, covered with sand, left out in the sun, stood on, drenched in sweat and their still going no worries.
Only gripe are those stupid ear feeder metal rod things that are supposed to make them more comfy going round your ear, cut them off straight away.