I think source makes a difference. I played them through a iMod with a cheap cMoy and it sounded good. Played through Nano sounded like poo. Played through a Zune, sounded great. Playing it currently through my laptop and it sounds OK, but it's EQ'd.
The bass REALLY tames down after burn in. i.e. I got mine a week ago and just leave it playing overnight on iTunes and everyday, I notice something different. The bass is nowhere near as boomy as it was out of the box, and has tightened. But the veil still hasn't lifted. And the highs are rolled off on songs where it goes to the extreme. Also, if you don't force these beasts in DEEP, it's not as veiled. Also, they're pretty sesitive as to how they're positioned in your ear, unlike UM2s, where the only difference in sound you get is if your seal sucks. Maybe it was just teh shape of my ear that complimented UM2s, but those IEMs are awesome, and SQ only degraded with a seal, not positioning.
Basically, these are AWESOME activity cans. Cans you don't care about if you wreck them, or how you wrap them in your pocket.
Coming from UM2s I can tell you these are nowhere near as accurate, and will get worked if A/B. A comparison to KSC75's is a little more fair. It has more bass than a KSC75, but isn't as airy, but it's not an annoying earclip and is more comfy.
Meh, I dig these over KSC 75's, but the KSCs aren't going anywhere