Very impressed with those headphones, they perfectly fit and the bass quality is excellent !
Audio quality: Excellent bass and high tones. No noticeable saturation.
Comfort: They fit very well (three different sizes), feel very light. does not irritate the ear, but can feel strange after a few hours of listening. The left and right wire length are wisely adapted. Don't fall while running, but need to use the clip.
Noise isolation: They will eliminate much of the background ambience, but would still hear it at low volumes (so no total isolation). From the outside, even with volume to the max, no one would ear anything, unless unplugged.
Build quality: very solid, the jack connector is long though, but my guess is that it will eventually get damaged with time.
Overall they are great. Not the cheapest headphones but they are equivalent to the much more expensive ones I had (from bose), but come with the mic, and the iphone button function!
I realise that there are two slightly different versions, I bought the chrome one with the straight jack connector. for £35.