I have just about every GoPro mount they offer. I use them for everything. From my motorcycle and 4wheeler to 150+ mph on my Steeda Mustang. I haven't had any fail yet but I ALWAYS run a tether! I built my own tethers from small stainless cable and eyelets. I also put some heat shrink plastic on the cable to prevent scratching any painted areas on my rides. I'm sure that even the best mounts will fail at some point (GoPro is ALL plastic) from either extreme use or overuse. So just build some good tethers and secure them in a manor that when the mount fails you just replace the mount and not a $400 camera plus all your footage too.
^ Tether all the time.
Agree'd Tether & Tether good. My GP suction cup setup has seem lots of duty... taken some good blows from branches, seen 170+mph, and waves of water pounding it. Only had one case where it came loose, applied it on dirty surface, and ran a **** poor single fishing line tether... $450 lesson I wont repeat
Inside of wind shield it lasted a whole prerun at Freedom 250 lap at Barstow.....
Curious where you guys are mounting your in-truck setups. Inside is my preferred spot as its hardwired, no battery concerns, but really trying to find location with the least windshield glare. Best i've come up with is mount stuck on windshield behind the dot matrix as close to glass as possible.