Once my Sennheiser PX 100's break, i'm getting a new pair, seriously.
This pair has lasted me so far, around 5 years, and they are still going strong.
They aren't closed so the sound is a lot warmer, but because of this, sound does leak, but only at higher volumes.
I've listened to music on the bus/way home perfectly fine without any issues with sound upsetting anyone, or not being able to hear the music properly.
They are vibrant with wonderful response, lows and highs, and are the best set I've tried by far.
A really good match with an excellent player, and they are pretty cheap too!