I'm a big fan of the Etys. I use the 4s at home and the ER-6s with my iPod. Highly recommend the ER-6 earphones - cheaper than the ER-4s with sound almost as good and much less microphone effect from the cords. The only real drawback as far as I'm concerned is that they cut out so much noise you can't use them if you need to hear anything. This, however, makes them ideal for air travel. An iPod, pair of ER-6s, and a collection of high-res Blue Note MP3s almost makes flying enjoyable.