These seem fairly solid. Used these on a 7 string build, had to buy them as a 3x3 set and then get a single as well, but these were one of the few brands that offered that, so major kudos. Casting looks pretty good, and the plating is quite good, maybe thin but no issues. The gearing has a juiuust a bit more slop than better brands when changing rotation direction, but all gear systems need some to even operate, well within my tolerance. These are holding tune quite well, the headstock I'm using these on has the parallel string direction, so the strings go straight through the nut, no real side to side friction to cause any binding. The lock system may feel a little cheap, but the pin engages the string as it should. I have removed a set of strings from them once, and noticed the notch left on the strings is a little bigger than other locking tuners of this style, no deal breaker but it may indicate a wider tolerance in their manufacturing. You can remove the locking knob entirely, and this exposed the gearing in the tuner, I noticed the brass worm gear and the worm both looked to have been machined pretty well, no deep grinding marks, look lightly brushed. Impressive really.They work well, look good, and feel ok when tuning. Can't speak to longevity just yet, but they're tuners, not something that gets constant wear.