Eef,
have a search in the forums for my "kind of review" when I got my b/t kit installed. Not sure how to post the link to my thread, so you'll need to search for it - either in this forum or the ICE one.
Whilst bluetooth is supposed to be a common standard, Nokia have been nobbling it since day one, and i've yet to hear of anyone who is happy with any Nokia + non-Nokia set up. Nokia b/t kit with Nokia phone seems to be OK, but then that's a bit like only being able to use Audi fuel in our A3's!!
My SonyEricsson works mint with any b/t phone I chuck at it - currently a SE T610 & Moto V600. A Huntley in the thread above has positioned his in the same location I did, and it looks great - esp at night the lighting looks OEM.
Got mine professionally installed and it mutes hifi and sound comes through car speakers.
Mint!!!