Gopro has the 64 listed on their site, that is why I asked.
I had one fall off the F30Driver.com project 328i. We were filming the X1 and had it on the bumper. The bumper has some flex so it was able to move around, over bumps it slipped down to a seam, broke the suction and fell off. We were only doing 25 or so and the camera was fine, the lens got scratched but it is replaceable so it wasn't a big deal.
My E46 M3 Rebuild Thread