There are 2 kinds of chrono owners. Those who have shot their chrono, and those who will.
That said, I have 2 chronos, Pact and CED. Both have the electronics separate from the sensors so a bad aim incident destroys the sensors, not the expensive part.
I change the battery when it starts acting funny. My chronos do not get used much, but the conditions can be extreme (hot/cold) and the batteries wear out quick.It works OK, but this weekend I got some really strange results and the display started showing some characters not seen before.