They work as good as Grover sta tite tuners.

Not top quality, but work smoothly. The knobs are small, but I intended them for a Ukulele and they fit just right. The arms holding the worm gear are closed. I think they may last longer as a result. I would buy them again.

These machines seem to be well constructed. They operate smoothly and tune easily and stay there. That's what tuners are supposed to do. They are obviously not of the highest quality, but seem great for the price. So many guitars come equipped with heavy tuners that too soon turn difficult to turn, with rough spots causing tuning to be difficult and short lived. My main reason for buying these tuners was to decrease the headstock weight of a medium priced guitar that my son owns. The tuners did this well and performed well in the process. Not everyone agrees with me on this, but sound is a very subjective thing in a guitar. I feel that most guitars could benefit from lighter weight tuners, look at how many very upscale guitars use (another brand) open back tuners as a very expensive upgrade. These are the lightest tuners I could find easily, and with the plastic buttons (very well constructed) offered just what I needed to lighten this guitar and sweeten the overall tone and preserve the woody-ness of sound I was looking for.

No. They're not Grover. Yes, much better than the Tanglewood machine heads I had on the guitar. They're way more solid, you can feel the resistence both on and off the guitar while turning them. The hole pattern was the same as the other open back machine heads I had on there. The build quality is way better. I'd definitely recommend these items for replacement. If I could review them with Grover Open Back machine heads, I would but this is the first time I've replaced machine heads.

Only thing that was different was the bushing size. The old bushings from the Tanglewood machine heads fit with the new machine heads. I didn't want to make larger holes through the headstock. It worked well!

Had trouble finding a tuner to repair Fender Acoustic. Took a shot on these, screw pattern identicle, seem sturdy, pleased with purchase.