I've installed these on the Harley Benton Single Cut kit guitar to improve the tuning stability, which they did, but not to the extent that I was expecting. However, this may not be due to the tuners but other factors such as the nut quality, the string angle at the head-stock, etc.
I do believe these are very finely crafted, they look nice and polished and they're really a pleasure to turn.
I wouldn't hesitate to recommend them if I didn't have a dilemma on what caused my guitar to have unstable tuning.