Not many! I really appreciate that they come with extra foam earcups, and the length of the cord is perfect for working out w/ a CD player attached. The styling is attractive, and they do stay firmly on your head even while running, even though you will be so distracted by the excruciating ear pain that you wont be able to jog.

Weaknesses far outweigh the strengths... I usually give reviews on the positive side, but cannot recommend these headphones to anyone.

I was shocked and saddened when I listened to these headphones. The sound quality is average, and I would give them an OK rating based on that, but the design is failing. Wearing these headphones is uncomfortable for even just a minute... they simply do not sit flat on the ears, and leave you in pain after you take them off... they bend your ears, and the tabs dig into your head. Because they dont sit flat they let in more background noise than is acceptable.