Just bought one of these. Worked straight out of the packet. I carry 2 phones, currently a Blackberry for work (but about to change to a Samsung) and a HTC HD2 as a personal phone. As soon as I powered on the Buddy, it detected the HTC and paired immediately. I had to put the Buddy into pairing mode, and search from the BBerry, but you normally do this with any handsfree anyway. The reason I bought this is so I can have both phones ready on handsfree when I'm driving, and it works perfectly. I can take a call from my office, and when I'm done, I can call from my personal phone. Both phones reconnect automatically when I return to the car, having forgotten to turn the Buddy off. Which is something you need to remember, if you park near to where you are working, or on your drive at home. I keep forgetting to switch it off at home, and end up having to go out to the car after swearing at my phone wondering why I can't hear anything...!
Call clarity, I've been told, is much better at the other end than it was using a bluetooth headset. And the Buddy has a pretty good volume on it, considering it uses battery power. An in car charger is supplied, it's the same usb connection as my HTC HD2, which is very convenient.
One thing to remember. If like me you sometimes use a headset on site, and you are still on a call as you return to the car, the phone wont automatically reconnect until you turn off the headset.
All in all, I'm very pleased with this item, it works straight out of the box and is very simple to use.