I had a problem with the left side of the headset, it fell out when I gently picked the headphones up. I informed superfi, they offered to repair them but i wanted a refund.
Superfi (play.com) gave me a refund after returning the goods complete with packaging (freepost) and were prompt, and a pleasure to deal with.
The speakers have good sound quality and the noise cancellation (NC) works well. The static sound a fellow reviewer refers to must be when turning the NC on when its quiet as there is nothing for the system to cancel out.