Spent quite a long time reviewing the various products on offer, from cheap and cheerful to fully integrated car solutions. Didn't want the hassle or cost of getting something fitted in the car and also wanted the benefits of portability.
Connected the HCB-150 to the power in the car turned on the Bluetooth on my Sony Ericsson C510 and both paired instantly. Phone book, recent calls all immediately avaiable form the HCB-150.
Turned the Bluetooth on on my work Blackberry 8800 and it also paired immediately, with contacts, calls available.
Using the HCB-150 and switching between phones is very straightforward. Speaker quality good. Still working on the best place to locate the unit for optimum microphone pickup as, I'm told, I can sound quite quiet. However, the fixing clip that comes with the unit makes it easy to move it around.
This is not the cheapest product around but it comes with good functionality and is very easy to use.