I am still using an old ProChrono and it still works fine for my purposes as I’m gotten through the compulsion of the statistical analysis days when I was using an MS which I never got along well with. I could never get it fixed to the barrel well enough to not have to fiddle around with it about after each shot With admittedly some significant kickers. And fixing it to the bench as some have done (Dirtfarmer IIRC) was not an option.
To show you how an older person tends to streamline things, I now go out mostly on overcast days, eliminating the putting up of the ProChrono diffusers. Works great.
And thankfully, it hasn’t been shot since a friend borrowed it.
