I personally found sound acceptable, if you want natural sounding bass you'll always need to go for over-ear headphones. The only plug earphones I've listened to with strong bass tend to sound unnatural. Ultimately at this size, you'll never achieve deep bass.
The carry case is great if you don't want to unfurl cables every time you use it, but can be a little awkward to wind back up as if you don't get it right the plug can end up wound on to a corner of the triangular case and you'll have to un-wind it, then re-wind it so you can get the cover on.
My biggest issues, is that if you lose the gel tips (which ALWAYS happens eventually) apple want you to buy new earphones at £65! because they don't sell replacement gel tips. You can buy replacements from amazon, etc.. but they are just not as good quality. Really feel let down by this policy and will be being from someone else next time.