Owned these for a while, and they are absolutely fantastic. I use them with my ipod, and the sound quality far far surpasses that of the apple headphones, (which i think aren't half bad in themselves, so says a lot.)
They fit snugly into your ears and cancel out a lot of background noise: Which means you don't have to listen to everyone on the train when on your way to work! They also don't give off a lot of noise to everyone else, so you can have your music fairly loud without annoying the rest of the world... Brilliant for those who like metal and hardcore music!
I have also used these with my nintendo ds and my psp, and once again the sound quality is fantastic. When used with a pc i wasn't let down either.
The cables are symmetrical so you don't have the annoying one side longer than the other.
I would definately reccomend these to the masses, and they are cheaper on here than on the highstreet (which is where i got mine, i know, i'm a mug!)
To sum up, if you're thinking of getting bose headphones but don't want to part with the cash; buy these! Put the bose one's on your christmas list and hope that santa thinks you've all been good boys and girls this year!