Try a quick search, there are several reviews of them on several different forums.
They work and are pretty decent. Some people are hving problems with popping. My own opinion is this is a partially due to the ipaq (resources when playing, memory available, cpu, etc). I also understand that wi-fi and other items can interfere. Not an expoert here, so I can't say for sure if that is true.
I find they are not perfect. For example, I listened to music for approx 2 hours. I had the pda clipped to my pocket. I had about 5 times where the music seemed to skip. Other than that it was fine. I could walk around my office with the pda in the cradle and it was fine.
Worth the money? For me yes, becuase I like getting these gadgets. Not alot of choices out there either. I don't have a problem with a bit of popping now and then, but I would enjoy them more at $49.99
