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I have JayBirds SportBand 2 for running in/gym (with my iPhone 3GS). They're useful to have because, unlike my Klipsch S5i, you can hear the rest of the world (and cars which are about to hit you). They stay on my head securely and have a lifetime warranty against sweat/rain.
However, the quality is not close to my S5i or Acoustic Energy Aego M (PC Speakers). There is a big improvement with an Apt-X adapter (I don't have one for my phone, just a cheap USB for the PC).
So yeah, if you need wireless for sports etc, they do the job well. Obviously much better wired quality can be had for the same money, however.