I bought these tuners to be fitted on an old instrument, and after a minor slot size adjustment on the guitar they complete the vintage look beautifully. If you are worried about whether the tuners will fit your guitar, Gotoh website provides even more detailed specification sheets with all the necessary measurements.
I've been lucky enough to have never had any major tuning stability issues even with cheaper tuners and these, of course, are no exception. However I was extremely pleased how precisely the smooth rotation of the peg translates to string tension, there are no dead zones on these tuners — no more jumpy notes and fiddling with the pegs back and forth to get the tuning as accurate as possible! Fantastic!