I have a garmin 55. I had a papago before that.
I also have the parking mode cable, so it records whenever it senses movement. What I have learned from that is that people try my doors all the time, and people bump my vehicle a whole lot more than I ever imagined.

I had problems with the garmin 55 overheating (in september, in Canada) and I had a warranty exchange with it. the new one hasn't crapped out yet, but it does overheat and shut down from time to time.

Next one I buy will have a capacitor instead of a battery. I do like the incredibly small size of the garmin 55, and the voice controls. The tiny mount is very good too.