I've tried a lot of headphones over the years being a pro musician, but these have 3 major plus points:
1). They have excellent freq response - deep bass, clear treble, a very good overall sound.
2). They keep out much of the noise going on around you. This isn't total isolation (for that you are going to need something like the Shure E2c, or Etymotic ER6 and the price that goes with them!). This has the huge hearing health benefit of enabling you to turn the volume of your player right down because you are not fighting with other sounds. Better for the ears (and those around you who don't want to hear your music).
3). The price. Other models from top brands like Sony, Phillips, Senheiser etc. in my opinion are not as good - yet they cost more.
Down side? In my view they are somewhat delicate compared to 'closed shell' plastic models. So don't expect to stuff them in the bottom of your bag and not to damage them eventually. It would have been good for Creative to supply a little case to avoid this.