Hondo,
My ProChrono is very consistent in varying light conditions--but it's a recent model.
It's certainly much easier to "back figure" muzzle velocities these days, using software! And it certainly provides as much information as any of us really need.
I use chronographs mostly because of my profession, which pretty much demands it. Plus, it's a lot easier for me to test 4-6 rifles (a typical afternoon at the range for me) over a chronograph, rather than shooting them at various distances to obtain muzzle velocity. Then I test the rifles I may use at longer distances at the local 1000-yard range.
