Honestly, for the price these are killer tuners, they're precise, they hold tune really well. My good experience unfortunately didn't last too long with them, I've had these for not even a month. When I've first restrung them I hand tightened them pretty solidly, but definitely not too much. I've used them for 3 weeks, and I went to restring my guitar. Unfortunately my high E tuner has a broken threaded bolt end from the head of the locking mechanism, so I'm stuck with a tuner that I can not unlock. The other tuners are completely fine tho. I would recommend this product, despite this issue, I'm pretty sure it's not too common. Will ask for reinburement.