Re: chronograph sugestions
I have had no problems and no complaints with my Shooting Chrony Master.
It did act flaky once and cleaned up after replacing the battery.
Otherwise, I have nothing to compare it to. I just wish I'd had one years ago.
I have also not done anything to validate or calibrate it. But, I don't seem to have major issues with my ballistics programs, BC's, and trajectories out to about 1k as some people report.
With low dollar consumer electronics, luck of the draw could always be a factor.
Since nothing's broken (yet), I can't really speak to the customer service either.