fantastic set of headphones!
I brought these a few days ago as a replacement for another pair of sony in-ear headphones and have been very inpressed so far. The sound is amazing, they block out external noise well, stop noise from escaping as they fit well into the ear but they are still comfortable.
£30 Is the cheapest i have seen them and they are well worth the money! The only bad point is the long cable which can be anoying but the sound more than makes up for that!