For the money, you can't beat the Chrony F1. It's cheap and dependable. I bought one from Midway when it was on sale. It got thrown in the trunk and gets used since it's there. Compared to a few other "More Expensive" units, it does pretty good. It does NOT have a memory or calculator for SD, etc. For simple chronographing of reloads, it's a workhorse.
Have used a Pact for 20 years. Blew up some skyscreens and damaged one sensor when testing slugs and odd loads (wads fly out). They are great on service. CED looks good if you want the PC option, for more $. I made a chart with all entries on Pact, put 8 on a page so I can quickly write results.
I have used a Pact for many years. BEFORE the first shot was fired over it, I made steel shields that I installed in front of both sensors. The first time I let someone besides myself fire a round over it, the front sensor shield stopped 3 pellets from destroying the sensor. Hope this helps.