I just ordered my second set of these 'phones. I've had a set for 5 years, during which I have used them daily. They've been dropped, knocked, squashed, constantly pulled in and out of various devices. Obviously they're looking a bit worse for wear; in fact the plug is at a funny angle due to someone tripping on the cable and yanking it out of the PC... this killed my sound card's socket... but the headphones survived this and all the other abuse they've taken over the years. They still work and still sound as good as they ever did.
Which brings me to my next and most important point... they sound great. Admittedly I am not an 'audiophile'; I just love music. Many different genres of music, all of which these 'phones handle very well. They like bass and are particularly good for hip-hop, reggae, blues and rock. I seem to get the best sound by simply using Winamp's "Reggae" preset for almost everything. They are also great for movies and games.
Finally they are comfortable. Many headphones cause problems for me when wearing glasses, but not these. They are light enough to wear for extended periods, and they fit well without applying excessive pressure. Plus the long cable is very handy... even if it is occasionally a Health and Safety risk ;-)
These headphones are much better than you should expect for the price. The build quality may not look great, but they really are built to last - which is why I'm buying them again, not as a replacement but as a spare for the ones which still do the job after 5 years of hard use. In the interests of a balanced review I want to say something bad about them, but I honestly can't think of anything...