I'll write something compared to other headphones I have, but that's really not going to be much of a "proper" review. I don't own any IEMs, only a pair of Crossroads that my girlfriend stole a last year (and later dumped in the "big box of junk").
For now a simple comparison of 5 hours of use - they sound nice, nothing "special", but fairly balanced in terms of not too warm and detailed enough not to miss the obvious (which a lot of low-end IEMs tend to do).
The fit and comfort is quite nice, not fatiguing on a 5 hour flight so that's nice.
From pure memory, they sound decent compared to my other headphones, but really not up to par with the "good" ones. This is of course purely based on what I remember my good headphones sounding like and playing out of an iPod Nano 2G so the source is seriously lacking for critical listening (not that I would really use these anywhere except on the go).