I bought these to replace cheap vintage-style tuners on an Asian-made LP copy. These do the job well, and they fit into a standard vintage Kluson holes perfectly (except that there's obviously one hole left).
They feel quite sturdy and well-made. They also have a locking mechanism, which means you can forget that "wrongly wrapped string" is even a thing.
The slight complaint i have with these is that they're not precise enough - they are ever so slightly too easy to turn, and the ratio is too small (too big?). However, considering the price, that is to be expected.