Been using these in the guitars I build.
Does what it says on the tin.
Keeps the tune alright.
Looks nice.
The only problem are the tiny screws that attach the tuners to the guitar, the head of the screw seems to snap off every time you give em that last twist to make sure they are tight.
For this price I don't really mind drilling the screw remains out of the wood.
Would buy again, and again, and again, as I've been doing every few months.