I use these for my MP3 players and I listen to hip-hop, reggae, dubstep, drum and bass and a bit of UK garage, and these headphones are perfect for what I listen to. I would say they would suit any dance music, metal and rock music too. In fact if your MP3 has an equaliser function then they would suit most music genres.
The bass is deep and punchy without overpowering the midrange and treble. I have tried out many headphones around the £50 - £60 price range and these are the best I have found. I like deep, tight, punchy bass and these don't dissapoint. The high end frequencies are lively and precise and overall the level of detail puts them up there with much pricer rivals. My MP3 player has no problems driving them either. I tried out a pair of Beats and these hold their own. The bass on beats sound slighty muffled and with the bass being very pronounced music can sound a little stuffy on the Beats, fortunately the WS50's don't have this problem which is an issue for most headphones designed to enhance bass. I am not suggesting the sound quality is superior to beats (although any difference is negligable), just that the WS50's are better balanced.
They look very good, however the headband is a bit plasticy and a little flimsy. The cable is a good thickness and where the cable meets the jack it is re-enforced quite nicely. My only complaint is that the cable connects to both sides of the phones and cannot be disconnected. As a result for me these headphones with probably only last me about 6 months, as in the case of all my previous headphones, the cable where it means the jack always gives out between 3 and 6 months.
For the price (I paid £) they are great value, and certainly enhance the pleasure I get when listening to music with them.