Pros: Very good noise cancellation, relatively little background hiss, great sound.
Cons: Bad microphonics, and the cable has a mind of its own.
Really excellent for travel, as they're quite comfortable and have excellent noise cancellation for the price. My one complaint is that the cable is a bit short, and makes a good deal of noise. Furthermore, the rubbery plastic coating makes awful tangles in your pocket. Otherwise a fantastic IEM, especially considering the $50 price tag on Amazon right now.