As long as you have a chrono, & it works accurately for you then that's all you need, what anyone else uses is largely academic if theirs works for them.

Is the F1 the best chrono ? NO, not by a country mile. However is it a good value unit for Joe average ? yes it is.

Personally speaking the F1 is no good for me because if I'm load testing I want to record multiple strings & be able to compare min, max, ave, & spread later, along with the target grouping, so I use a pro chrono which lets me do all that.

I only lasted through the vid to where the derisory comments about the variations like the printer started, but that's longer than with most.