The feel takes a little getting used to, but they sound good. My biggest problem with them is that the plastic piece that sticks in your ear has a tendency to fall off if you're pulling them in/out of a pocket.
If you have these and find that the earpiece keeps falling out, or you lose them, Bose has acknowledged the problem and will send you a new set for free:
http://www.bose.com/controller?event=DTC_LINKS_TARGET_EVENT&DTCLinkID=7518&src=ENHANCE
(found link at gizmodo)