I know a few people on the HeadFi site have recommended these as a good set of portable phones,so after a good deal of looking for alternatives,I decided to try a blind purchase as an early Xmas present.
For those that havent seen them before,it's a set of lightweight,not quite in ear electrostatic phones,with a portable energiser,and whilst lightweight in construction,the build quality seems up to what you would expect from Stax.
Sound-wise,although these are pretty much straight out of the box,bass is well extended,although not as weighty as that from my Earmax/HD600,but the midrange is if anything faster,and more detailed,whilst the treble is moderately rolled off in comparison,but still detailed and clear(this is well described in other reviews,so it wasnt unexpected to find my own results being the same).
In short,an excellent replacement for the old earbuds,and a much better match for an iPod than the Etymotics I'd used on and off before,if a bit on the pricey side.
The only complaint is the vice-like grip of the headband(!) which will have to be bent slightly,to stop it drilling the earpieces into place.
PS...the service from both the distributor and dealer(SimplyStax) was superb.
http://www.stax.co.jp/ENG/in-the-ear.html