I just got my UE 5s for christmas and couldn't be happier. They are my 2nd pair of good phones, with the first being Sennheiser 555s. A step up in SQ IMO.
The isolation is amazing, haven't had isolation in a while since Senns are open. I can now listen to high quality music in the car instead of crappy, uncomfortable ibuds.
Oh, and I haven't shivered yet, I started listening to Enya now, it sounds SO GOOD on these. I like acoustic also, but the sound with Enya seems to "flow" right out of the IEMs into my ears, like a strong and calm river.