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Yeah - I got mine after I was road rage hit and run'd (also run down from behind). Funnily enough the only major off since then (collarbone smash) didn't really use the footage as his insurers admitted liability straight away and there were witnesses.
However, on more than one occasion I've pointed the cameras out to arsey drivers and they have backed off. Tbh would report more stuff if I had the time.
I figure that with cameras there is at least a chance they'll catch the bastard who eventually kills me.