I've installed them on a 2021 MIM strat. Had minor tuning stability issues with the original ones, but most important, there were some annoying intonation problems. Must mention that at the same time I installed Highwood 10.5 saddles. I cannot say if it's the locking tuners or the new saddles alone that make the difference. I just can say that now there is no problem at all, the guitar sounds and play lovely! Highly recommended, grate upgrade, and great Thomann services as always.