If you dont want my background or to understand why I ultimately chose the 598s, skip to "ENTER THE HD 598s. Most of the time the sound comes from only 1 earbud, the sound keeps breaking, or alternating between the earbuds. I mean, if you look, it is $20 less than the Firefly. I very much appreciate the volume dial and the mute button on the top right. Hmm. This is really useful behind furniture. Does not have a good mic pickup, sounded distant and hard for the receiver to hear. Very happy with the quality and the look. Minnetonka waren auf Grund des hohen Preises bisher unerreichbar für mich. The sound stage is wide and precise, you can hear things you simply dont notice with cheaper earphones (and some things Id not noticed even with the Sennheisers, which surprised me).