I've had some experience with product testing and the thing that brings out the gremlins is testing at the extremes. It's not surprising to me anymore to find things that work well at 70° F crape out when testing near the minimum and maximum temperature the equipment is specified for. I believe it's possible to make a folding chronograph that's reliable and reasonably accurate, but not for the price of a folding Chrony.
What I don't like about the Competition Electronics ProChrono is the potential damage a stray shot can cause. I know, it never happens, yet I've managed to put holes through screens when experimenting at various distances and guns. At least with the Oehler sky screens you can glue them back together if you don't hit the lens or the photocell and it's not expensive to keep spare screens and parts on hand for the more serious blunders.
