Greenie

I don't quite understand what you mean by "rolled off treble." Have you tried listening to a source other than an iPod/iPhone with these headphones? What other headphones have you used with your iPod/iPhone that do not reproduce this treble issue? I don't have any issues with the treble response on my S4i headphones, in use 15+ hours a week for quite a few months now. At least 1-2 days out of every week I spend my day hearing music on professional studio monitor headphones, studio monitor speakers, the S4i phones, and top-end concert/nightclub installation, and aside from the expected change in sound dynamics, I'm not bothered by any loss of treble, bass or overall response. For treble specifically, the only headphones that provide me a notable improvement over the S4i is a custom-molded, professional in-ear monitor. Even then it's less an issue of "response" so much as it is overall sound clarity. Which should be expected when comparing a $100 S4i to an $800 UE-7. Perhaps you've got some bad drivers. Have you tried to exchange them?

Picked up a pair myself a few days ago. EXTREMELY happy with the overall sound quality, the fit of the large buds is comfortable and snug, and while I'm a bit bummed I can't control volume (using iPhone 3G) the play/pause/skip forward/skip backward/answer call functionality of the remote works great. Very pleased with the purchase!