im acutally pretty interested in getting one of these, have been reading some reviews on it nd they seem to be good.
Heres a link to a UK car site that has a few reviews on it
I have been looking at these too, but have discovered that they operate via their own internal amplifier. i.e. they break the connection to the car speakers and drive them independently of the head unit.
This is great for the phone functions, but less than ideal for music playback.
I am thinking of going for a dension solution for the ipod and a phone only solution from parrot or bury.
I did buy this product and I installed it at Selective Sound ( West side of Mississauga - Highly recommend this place because he was the cheapest to install and pretty honest - great work done.)
So far I'm very happy with this product. I speak/take calls through my car's Speakers, and it's almost like CD quality. I asked people if they could hear me and they responded positively.
I also connect my iPod Touch 2G and now I can listen to all my music, again through my car's speakers, like CD quality.
It's pricey, but shop around... Especially for the simple reason of the laws changing and the Hands Free Bluetooth capabilities for my cell phone.