I just installed these in my project guitar, a Monoprice Indio Classic. Total time from start to finish was 40 minutes. I am no luthier.Fit perfectly: I did not have to drill any new holes and they simply dropped in. They are snug, no wiggle after bolted and screwed down. The screws that came with this were slightly larger than the originals which to me is a plus.Appearance is really nice. They have no branding, which is also a positive in my eyes. They look better on the guitar than in the pictures you will find here on Amazon.Finally, and most importantly, they work really well. Easy to snug the strings into the tuning head and very intuitive to use. Made the restring job much easier, and less frustrating, then they usually are for me.I intend to replace all my electric guitar tuners with these. I cannot comment on the longevity yet, but if they fall apart or fail in the future I will post an update. They look solid; but who knows? I can say the metal on the super cheap tuners I replaced literally was flaking off already.I highly recommend these. Hopefully this review helps you. I read several prior to placing my order and they were spot on. Great locking tuners for a very fair price.Peace!