These ones in particular: the sound is amazingly clear, no distortions, very clear bass, but not a strong base. the sound, while very flat, is very flattering to music files and the earbuds rest comfortably in your ears. I truly believe they'd fit 99% of the ears out there.
I've also had a chance to listen to the SE215 and considering the price difference, i'm inclined to say that those earphones sound truly amazing (though not as flat as the 535 if you will use them mostly for monitoring).
Can't really find anything wrong with them to be completely honest. Ah...maybe i'd like the nozzle to be metal, since i think there is a risk of breaking them when changing the foams on it if you are not twisting it right. And for this limited edition, maybe shure have gone a bit further and toss in a cable with a microphone on it.
Conclusion: AMAZING earphones, a tad expensive, but you get good quality for the money.