Really neat design, attractive and unusual - they sit well in the ear due to the little elbows that bias against your skin. They are light. They come with an optional clip to clip the phones to your clothes, 4 sizes of ear pad and a reel to wind up excess chord when you don't need it.
I'm a bit long in the tooth to be judging the frequency response of headphones - my own ears have no doubt lost a lot at the margins - but a quick comparison against a set of beats full size headphones in the shop using the same audio file from the same MP3 player left me more or less unable to find a meaningful difference. I do detect a slight difference between these and the apple earbuds that came witht he mp3 player (the Sony is slightly better). in terms of ergonomics they are vastly superior.
The beats are of course several multiples of the price.