i think the zipper case comes with the e5c model. (EDIT: the zipper case for the e5 is fiction! thanks, mchurgin!)
i went looking for it on their store website under accessories, but it's not there...probably have to call them and order it.
yes, they are pretty incredible earphones, i love mine to death.
it's pretty incredible, at just over 50% volume on my ipod, depending on the source mp4, it is often loud to the point of pain...i'm not a loudness freak, but it'll obviously save me some serious battery! i consider that a pleasant perk.
the sound is much more clear and well-rounded than my e2's, and i have noticed sounds placed "beyond my ears". a well-recorded piece does sound 3-dimensional, a very pleasant experience indeed. unfortunately, i haven't run across too many pieces recorded/mixed that well. of course, they can't really save a lousy sounding piece...garbage in, garbage out.
i dunno if it's a $400 difference over my e2's, but i'm happy!