They are very good technically (their range seems to be pretty even) with maybe a slight bias to bass. They tend to be "fun" headphones and are generally less cynical that something like the equally-priced Etymotics.
Aside from all the Audiophile speak, they sound great (but at the cost you would expect that) and, for me, it is extremely comfortable (i honestly cant wear normal earbuds).
Look at some of the stuff from ultimate ears, from what ive heard they seem to sound just as good for less cost (although this is not my opinion, as i have not personally tested them).
If you can, go in and test each earphone yourself as certain headphones may sound better to
you and may 'favour' some forms of music better.
Oh, and HeadRoom love 'em:
http://www.headphone.com/products/he.../shure-e4c.php