This is my first experience with noise cancelling headphones and I expect it won't be the last. I purchased these on the basis that they promised 90% noise cancellation/exclusion and having tried them out extensively, I'd say that the percentage is closer to 30-40%. If you use a white noise programme or have your music turned up to a reasonably loud level, then the percentage goes back up to 80-90% provided you get the volume balance right.
No need to iPod adapter, they click right into iPod connector.
Volume and skip forward/skip back controls on headphone cords.
Possibly the most comfortable ear fit I've experienced with a selection of ear inserts.
In general, a very good sound with nice bass response and clear sound.
These are powered directly from your iPod/iPhone and as such, they markedly reduce battery life.
Given the price point, I would have expected ability to stop music & take phone calls but these do not have this functionality.
Again, given the price point, I expected consistent quality throughout all ranges but generally, this is not the case (e.g. treble is okay, bass is quite good).
Overall, I'm glad I got them and their shortcomings don't make me want to return them but I think you could probably get the same quality for at least £20 less.