I am using the MM100 from Sennheiser http://www.sennheiser.com/sennheiser...e_music_504111

-good sound quality
-isolation is ok, can be used in loud car
-low profile, easy to pack and light to wear, compatible with eye glasses.
-no driving wind noise when listening on bicycle

-useless as a headset for calling over Skype - bluetooth and wifi don't go together (a lot of hick-ups in the sound when Wifi is enabled) with this combo
-low quality sound from "invisible micro" when calling over the cellular network