These headphones are pretty good and are a solid 4 stars...
THE GOOD: They are lightweight, comfortable and sleek-looking. I use them with my iPhone 4S and the headset/microphone work great, including giving commands to Siri (the virtual personal assistant). The range is impressive with my iPhone as I can walk into a completely different room and they still work perfectly!
THE BAD: Musicians may find the sound quality a bit lacking, e.g. base isn't resounding enough, highs aren't crisp enough, etc. Honestly though they're great quality and I'm perfectly satisfied, so if you're not hypersensitive to this sort of thing you'll be fine.
THE UGLY: They have no option to be plugged in, so if the battery dies you have to wait until they're charged before using them again. On a related note, the battery lasts for only a few hours (around 4 hours tops I'd say) and then you have to charge them, limiting their usefulness.
All-in-all, since I got these headphones at the discounted $50 price (yay Amazon!) rather than the $140 price, I'm a very happy customer. However, I'm not sure I would pay the full price for these, though I suppose it depends what the competition looks like.