I always run one. I'd like to get a rear facing one as well.
Our Camry has been hit several times now, and a couple of them could have easily been disputed. In one case my wife was getting off 26 and she was sitting on the off ramp at a light. The car in front of her put it into reverse and backed into her. They could have very easily said that she hit them and we didn't have a dash cam at that point, so how do you fight it?
We also had someone back into our parked car while we watched it happen from the doors of Fred Meyer.
There are a ton of morons out there, and having protection against them is extremely necessary.