Summary: I've owned a pair of PX 100's (the prior version of this set) for a couple of years. The difference between mine and these is that mine has a two-sided cord and comes with a hard case rather than a soft pouch. I can't say enough good things about these headphones.
Pros: Sound quality, one-sided cord, comfort, great value
Summary: As far as open-eared headphones go, these are great. They are not as good as the HD 202/203 due to those being enclosed, and not as much bass as the CX-300 earbuds. But these are very comparable to the excellent Koss Port-Pro and Koss Pro 25-35 series.
Pros: Lightweight, easy to store, great bass response, accurate mid range and highs
Cons: Originally bought them for my HTC Evo, duh, I should have paid closer attention to compatibility. Will work with i-Phones though. So more my fault than anything.
Summary: Very comfortable and stay on my ears when walking and listening to my iPod. I've used in-ear 'phones for years and they are convenient but when walking they work loose and I have to keep re-inserting them. These headphones have a wonderful sound even with my ageing ears and tinnitus.
Summary: You probably know it's awesome but I'm not going to explain it. These headphones can't be worn for long, the cushion is not that spongy and my ear ache's after 45 min or so. If you can get a good cushion for it then these are probably one of the best headphones.