Most of my guitars are equipped with locking nuts, and I've always wondered if adding locking tuners would really help make string changes less tedious. These are a really good, affordable way to see if the upgrade is worthwhile.These were packaged really well, and the overall fit and finish is very good considering the price. All the tuners rotate smoothly with no binding or excessive play. (You can easily remove the locking screw to access the gears for lubrication or to tighten the gear nut if needed.) The tips of the locking screw posts are beveled, which helps reduce the chance you'll shear off the string. Like most tuners, you can also adjust the button tension by tightening or loosening the button screw.These are slightly heavier than the typical non-locking tuners. On lighter guitars, you might notice a subtle shift in balance toward the headstock due to the additional weight. Lighter weight locking tuners exist, but they cost more.A few additional tips:• These are 18:1 ratio tuners (versus the usual 12:1 to 15:1 on most guitars), meaning you have to turn the tuning knob 18 times for the string post to complete one full rotation, but you get more precise control over tuning adjustment.• Pay attention to the button shape you prefer (these are oval, though hex versions are also available).• Check to see how your existing tuners are mounted on the headstock. Some use a small screw to hold the tuner in place, some have two alignment pins that fit into holes, etc. (These use two pins.) Matching the mounting style of your originals will make installation easier.Overall, these are a fantastic budget option for anyone curious about locking tuners who haven't tried them yet. I think they're a worthwhile upgrade over standard tuners if you change your strings more than a couple of times a year, even on guitars with locking nuts.