I can tell you I won't buy another Shooting Chrony product. Got a std F1 back in 1993 and "upgraded" to a Master F1 with the cable attached remote. The older std F1 worked well, was very simple, reliable and not finicky... The F1 Master was terrible overall. You literally could not shoot any higher than 2-3" above the sensors, and alignment had to be perfect. Just a hair off of dead center resulted in continuous errors.
The Master F1 was extremely finicky to lighting, and had no rhyme or reason for numerous errors, wild readings/no readings, you name it. Made testing a chore, a waste of ammo and a PITA. Recently got a Competition Electronics ProChrono Digital, and so far so good. Take the dang thing out of the box, add a battery, put up the rods and shoot! No errors yet, the shooting area is huge, and best of all it seems not very picky about lighting conditions. You can hook the ProChrono Digital to your computer to print results, and perform other functions with purchase of their software and cable.
I know some will rave about the Chrony, but I had enough and their CS was not so great at all in my experience, plus the CE is made in the USA not Canada. CE has a reasonable exchange cost when you need to replace a shot-up unit as well.