First off, these Sennheisers are super value. I paid £12 and for that price, you can't get a brand new pair of on-ear headphones that can beat this. The highs and lows, treble and bass is well balanced. The clarity far surpasses anything in the same price range. Clearly not Sennheiser's masterpeice, but they seem to be aimed at the infrequent user, who is simply looking to go one up from the poor stock earphones that came with their mp3 player (mp3/ipod compatible, very low impedance @ 24ohms).
HD 201's become uncomfortable and it gets hot under the pads after about 30mins of use, though this will keep you warm in the colder outside air..
For myself, comfort means alot. What's the point in a great set of headphones if listening to your music after half an hour become unbearable. Other than that, these would be a highly recommended bargain.