In reality, $30 dollar tuners shouldn’t be an upgrade to a >$1000 guitar, but this added so much more tuning stability to myJazzmaster. I’ve upgraded a few different guitars to locking tuners, and these are almost at the same level of other sets, which cost at least 2-3x as much. These are slightly sloppier, cheaper feeling, and lock the two different shaft heights that some have, but they are 90% there in looks, feel, and functionality categories. They feel slightly sticky, but that’s just a feel thing, they work great. They have a nice weight to them, they thread in easily, and were direct replacements. I’m very impressed by these.