Never owned one, just don't have any interest in the number crunching, data sheet, pie chart thing.
I reload a lot, shoot at the range at targets and see the results. Velocity I can surmise by the published reloading data I use.
but to be honest I really don't pay too much attention to that anyway.

I can see where lots of shooters like them and see them as an accessory to the reloading and shooting. Nothing wrong with that.