Waverlys are great. They beat most other tuners, open back or closed.
I suppose a drop of 3 in 1 oil every decade or so would be a good idea. (I have Waverlys on my SCGC. Bought it in 2002. Never oiled them. Hmmm.)
I recently put Rubners on a mandolin and I like them just as much. Rubner was going through some production changes recently, but all guitar models are in production.