I bought these headphones on Amazon after reading the fantastic reviews about them. they were cheap, looked good, and were apparently quite sturdy.
When I received them, I tried them in my house and was AMAZED at the sound quality. For £30 odd pounds, the sound is very clear, with nice bass (but not too much) and a good balance of frequencies.
However, when I tried them out and about, in the street, on the bus etc... I find that they just simply do NOT block out any sound! I can have my iPod on full volume, and still probably hear what someone is saying 5 metres away. This is really annoying for people who want to just get lost in their music, without having to listen to some annoying crying kid on the bus. This also means that the sound leak is pretty bad, although the volume on these is pretty low anyway - not for people who like their music LOUD. Another problem is that they're a bit tight for people with larger heads. They ARE generally comfy, but just bear that in mind.
If you are using these at home or somewhere quiet, I would definitely recommend them: great sound quality,comfy, strong, perfect length for the lead (and the lead only comes out of one side - big bonus)& they look great. Just not for Commuters!