I purchased the car mount thru Verizon and found it to be lacking the cigarette lighter adapter. The options were to buy a full car charger (with cord) or just the small stub adapter. Either way, the total price exceeded that option at Amazon of the entire kit (with the rapid charger). I returned the two boxes to Verizon and bought the kit from Amazon for $45.
Beyond the purchase annoyance, the car mount itself works great. The Droid 3 slides in easily and fits tightly (with the option of mounting the phone with or without a case). The cables are about the right length and I like the fact that power and audio both are contained in one cord coming from the car mount (versus the two cords required when I mounted my older Droid 1).
I would not hesitate at all to purchase the car mount.