I got a set of these today in black, and let me say that they are damned fantastic.
Firstly, the quality. Audio reproduction is awesome. Mids, highs and lows are all beautifully reproduced - I really don't own another pair of in-ear headphones like them. You can easily spend double on another pair but I don't think that you'd be able to distinguish them easily.
Be aware that many people have complained about lack of bass. This simply isn't the case - you just need to ensure that you have a good, deep, seal in your ear canal. The product ships with several replacement tips, but I found the default three-flange ones to be great for me. Many prefer the foam buds, however. Once they're in, I can hear virtually nothing of the surroundings which is fantastic whilst sitting at work.
Quality of the actual product itself is very good. Cabling is nice and not too noisy when rubbing against clothing, although some noise is inevitable. Microphone is excellent, having tested it in calls today and asking people what they thought!
Overall, I don't think you'll find a better pair of headphones for the price.