I havent had the item give me a single false switch in the months Ive been using it
Its really fast too - about 1 second or less.
You must have the unit powered all the time or it takes a while to startup and then switch (perhaps 1-3seconds). If that doesnt bother you, then I guess you could leave it in the switched state and only turn it on when you wanted the reverse camera signal. (It acts as a passthrough when OFF).
I have it (switchbox) always powered, but not in 'switched' mode. When I switch to reverse, I also use that signal to power the reverse camera. Thats probably why it takes a little longer (1sec) to switch - cause the camera is 'powering up' and doesnt provide a signal to lock to straight away.