I m impressed with this. Easy to install. I m not a luthiar but I have refretted a few guitars and made some nuts and saddles. This is a pretty incredible system. I was going to cut a new nut for an acoustic guitar I just bought. I tested it and it was not sliding perfectly through the nut even though there was no ping while tuning. The way I test a nut is to strike a note then smack the string between the nut and the machine heads. behind the nut I put a tuner on the head stock so I can watch the note go up and come back. It simulates a good bend and you can watch the quality of the nut you have on the guitar. Most guitars will stick at about 6 to 10 cents above the tuned note unless you have a really well cut nut. At least the wound strings will....steel strings will usually drop back to the tuned note if the nut is decent . The nut I had on this guitar was pretty good....no pings while tuning yet it would still catch occasionally which effected tuning.
My circa 1997 American Standard Strat always had a problem with staying in tune after whammy bar use. I tried pencil graphite and different string sizes with not much luck. I put this nut on and a set of Gotoh locking tuners and now it seems to stay in tune very well.
I bought two of these, one Gibson-style and one Fender-style for two of my favorite project guitars, an Epiphone LPX and my Jazz-O-Caster parts guitar. The Gibson was a near drop-in, needing only some trimming and shaping for a perfect fit. The Fender was slightly more challenging, as the neck on the Jazz-O-Caster never saw the inside of any Fender-approved factory! It required a 1/32" shim underneath for a proper fit, and some sanding to make room for the tang. There was a marked increase in the brightness of tone for both instruments, as well as improved intonation. This is MUCH easier than installing a traditional nut, and nearly foolproof IF you follow the instructions. Thanks, Stewart-Macdonald, for stocking such a well-engineered product.
I wrote another review about Zero Glide and my Gold Tone OB 150 banjo. As many already know the Zero Glide Nut is standard equipment on the OB 150 banjo. Gold Tone has this nut on other instruments too. I like this nut system for a lot of reasons. I installed a Zero Glide nut on my Martin D custom and I even installed a Zero Glide on my Washburn M3SWK F body mandolin. Those stock plastic nuts on many of the entry level pro instruments just does not cut it. You are cheating yourself and your audience out of a lot of tone and sweetness that ears should be hearing. The Zero Glide nut does a world of wonders for my instruments. Do yourself a favor and get one on your axe. You may love it. I know I do. I am addicted to Zero Glide.