I've been using an F-1 Chrony for about 15yrs now and it still keeps workiing fine for my purposes. Yes, it does miss a shot now and then; the instruction manual isn't the clearest(I always have to refer back to it to refresh my memory on how to reset, etc), and I do wish I'd gotten one with remote readout. That being said, it does work well and stores all the info. I need for about 6-10shot strings.. Don't think I paid more than $75 back then. Maybe I'll upgrade one of these days, but for the few times I cart it to the range, I doubt it.