I've just spent a lump of cash on a new E70 and a so-called "advanced" car kit to go with it.
You can't use the control button functionality (which is an important safety feature) of the car kit, and charge the phone, at the same time. If you want full functionality you have to take it out of the cradle and pair it with Bluetooth. On the other hand if you want your E70 to run on mains power, and put it back in the cradle, it cuts off Bluetooth and no longer works with the control button - you have to look down and press the buttons on the phone.
This is ridiculous. I am very annoyed that this serious and apparently un-fixable issue is not explained on the Nokia website or by the dealer. Having been a Nokia loyalist (all my family and company phones ) for very many years I've got to say this is a disappointment.