I'm going to use it for a few days and a couple trips around town first before I give a review. But my intial impressions of the kit is that it works just as advertised. Doesn't feel cheap, BT syncing is very easy and syncs every time I plug the phone in. Speaker volume is clear but may need to be louder. I still have to give it some time and adjust to my liking first (my car is pretty loud). And yes, I am using Navigon, but I have not yet downloaded their Live Traffice update.
Per the manual, calls will not come in through your car's speaker but instead the TomTom car kit's speaker.
I currently have the kit mounted on my windshield but I also tried mounting it on my dash. If you do not want to put that adhesive on your dash,
buy a Sticky Pad and lay it on your dash. Now mount the TomTom kit as you normally would on the sticky pad as if it were glass. It sticks and works very well. Alternatively, you can put the adhesive disk on the sticky pad if you want the suction cup of the TomTom kit to cling to a hard plastic surface. When you leave your car, just peel the Sticky Pad off of your dash and it will not leave any residue. Essentially it is a GPS friction mount. Or you can
buy this, but its just too big for my tastes.