I bought this IEM almost 2 years ago and I love them. They started to chip just a little bit, but it's not an issue. Build quality is great.
Sound:
Out of the box, with the tips and cable that comes with, they are just OK. First I bought InAirs foam tips. These tips gives better isolation, more secure fit and much better bass response.
Last week I also bought Mee Audio Silver plated cable (because stock cable broke) and OMG, the sound just got MUCH better. More smooth, but with better detail and noticable boost in bass quality. I finaly hear some of that sub-bass. With new cable the overall sound is much more full.
Sure, you need to buy additional stuff to make these IEM shine but it's worth it.
Also new cable is softer and microphonics of the old cable are almost gone.
Highly recommended!