I had the same model without the mic manufactured by creative. I was really happy as the quality sound is superbe with no distortion at all.
In addition to this they isolate very well from the noise outside, so I decided to go and buy the model for the iPhone.
It has been a week now since I have them and I am very happy. Same sound quality, and it is cool that you can use the little button to stop the music or with double click to go to next one.
The only complain is the mic. Looks like it is worse than the one you get with the earphones that come originally with the iPhone. The person at the other side of the line often complains that cannot hear me properly.
In the overall I am very happy. I am addicted to music, podcasts and audiobooks, that I listen to everyday, plus during office hours I plug them into my macbook pro and I listen somafm all day. A cool feature is that in a mac, you plug them in the headphones jack, but the mic will work if you are chatting in skype for instance. Very cool. Very mac.