These headphones are excellent - sound good, fit well and have a proper volume control that takes over from th ipod/iphone one.
The usual message comes up when you plug them into an iphone 4 - about them not being optimised for the unit - but they work flawlessly.
Truthfully the best headphones Ive used with my iphone and ipod classic (also tried them on a touch and they were fine again)
So the problem I had? Well I have my phone in a case on my belt most of the time and I can't do this when they are using these headphones as they use the dock connector and not the headphone jack - phone had to go in my pocket.... Not a big deal but a pain none the less.
Overall - recommended - and my hassle won't apply to most users.