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I got these for two reasons, first to improve tuning stability on my Strat, and secondly to simplify string changes. So far so good on both counts. Very easy to install, with a 10mm spanner or socket, though no instructions whatsoever were included, so you need to know that these are not all the same size, the taller posts are for the lower 3 strings. Great product, but really should come with some instructions.
These seem to be well made (in Taiwan) and substantial. These replaced the original Fender tuners on my American Standard Strat and were an easy install, no drilling or filing. There are cheaper alternatives but I wasn't prepared to risk any damage during fitting by trying them out. These are staggered in 3s whereas the originals just had the 1st 2 (E and A strings) which did not cause any issues. Update 14/03/19: I don't see any tuning stability change but restringing is definitely quicker to do.
Good quality locking tuners, easy install on 2012 mim strat, they did not however cure my tuning woes on it. Still goes out of tune with heavy vibrato use . But that is another situation in itself having proper bridge setup too