As a London commuter, they're perfect- even if you're not playing anything through them they can block out screeching brakes on the Tube, annoying tinny tunes from mobiles belonging to the kids at the back of a bus, an overcrowded Liverpool St station...the list goes on. What's more, they don't leak noise out either, so you're in your own world, which makes any journey far more bearable. And what's more, they sound terrific. After years of shoddy bass response on headphones, these deliver the goods.
But I'm on my fourth pair of these headphone in three years for the simple reason that the connecting cable are flimsy at best. On two of my previous three pairs, a small amount of stress or stretch where part of the (slightly overlong) wire was trapped in something or got pulled by accident caused the headphones to stop working. Obviously this isn't intentional, but things like this happen and it's annoying to have to shell out for a new pair when there must surely be a way of improving the cable protection.