The V1 is the definite choice with a lot of BMW guys on my board and around town. Today at the Ulti Drive I saw one in on the dash of a 3er down in the IR cutout. Black dash in the middle of summer. That thing must heat up like no other.
It was not on a bracket either it was velcro'd on there. Personally I would take the loss in range to save the unit from torture. Wouldn't all that sun kill the range just as much as IR glass?