Pros: Excellent bass quality and quantity, nice mids, great quality design and materials, great range of accessories
Cons: Treble very tip dependent
I've just finished reviewing these hybrid earphones and would describe them as great value for someone looking for an IEM with awesome bass (both quality and quantity), and an engaging, dynamic sound. They don't push the sound too far in any direction to make it sound unnatural, but they're also not an accuracy-focussed IEM.
The treble can be a bit harsh depending on the tips used and the bass will sound sloppy if the wrong filter is used (they come with 2 different filter options), but with the right tip and the right filter, they're as good as anything up to the same value (AUD $399) if you're looking for something to get your foot tapping and head bobbing.
My full review is over here: http://passionforsound.wordpress.com/2013/10/14/astrotec-ax-60/