I love the sound of these portable headphones, a good step above all the stock earbuds that come with players nowadays. The sound sig is great out of the box and I believe it improves some with some burn in.
 
You can also mod them quite a bit with various mods such as the quarter mod, kramer mod, and hd414 pad mod.

However, the cable is reaaallly the pits.. It used to be better, now I honestly cannot recommend them to anybody.

If you do buy them, and when they do break.. Buy a pair of sportapros to replace the drivers and cable.. I do NOT recommend trying to recable them.. or sending them in to KOSS unless you like waiting forever and jumping through hoops and paying shipping.