Bad experience. No rebate form in the box, and for so many people. We can download it, so whatever, but not a good start.
The unit itself is scaffolding overall. The one I got is anyway.
Charging: I didn't have the problem some others have reported with the high pitched whine. Mine came already fully charged. The LED lights all work fine.
Fit: The ear clip was made for a child. Wear it for 10 minutes and your ear will be sore unless you have smaller ears. Go without the clip and you'll spend a lot of time pushing on the unit to keep it in your ear - the rubber earpiece is large and doesn't want to stay lodged in, unless you have larger ear canals, I guess. Call that one subjective.
Build: Since I read that the ear clips break easily, I have been very careful with mine, but I can see that it's the kind of thing that does want to break easily. The talk button does nothing when pressed.
Pairing/Setup: Smooth, easy. No problems. (I use a Treo 650)
Initial Connection: Usually good. Takes a while sometimes to show up as connected. That could either be the phone or the earpiece - I believe it's the earpiece based on the otherwise good bluetooth performance of this phone.
Taking control - inbound: No problem here so far. Somebody calls while you're connected and it gives the earpiece control from the start.
Taking control - outbound: This is the major flaw. On outbound calls, I can only get the earpiece to take over the call about every sixth time or so. It appears to be random. The talk button never does nothing when clicked (though if you click and hold, it usually redials the last number). Once in control, however, I get no sound until halfway or all the way through the other person's outgoing voicemail recording. I never hear a ring. If the sound doesn't kick in until after the voicemail recording and beep, as sometimes happesn, then you start in silence and continue in silence - the only thing indicating that a call is in progress being the call timer on the phone. So you're waiting for some indication that a call has connected and meanwhile, though you don't know it, the person's voicemail is waiting for you to say something. I've found that if I turn the unit all the way off and then turn it back on right before I dial, it'll connect and control the call. If I try to make a second call after that, it'll work rarely but not usually. To get it to work again in that situation, I have to turn it off and back on. scaffolding performance.
Ongoing connection: Variable. Sometimes it's just fine, other times it cuts out so much and is so choppy that you can't have a conversation - you only get little fragments of whatever the other person is saying.
It's no wonder these things wound up on woot. What garbage. This thing is basically useless for me given it's unreliability in connecting for a call or letting me know that it's even ringing or that someone's voicemail is trying to talk to me.