I have an old Charvel San Dimas that had a metal nut (no rollers though). The tuning pegs are a bit off menaning that the strings have a slight angle sideways over the nut. This cretaed some tuning problems, especially when using the tremolo bar. I installed the LSR roller nut instead and all problems with keeping in tune and squirky noises were gone. I can even dive bomb with the tremolo bar and the guitar stays in tune. No tone loss either.
The incontestable winner in the harsh nut game (vibrato category). Expensive but its excellent quality justifies it. Useful fitting accessories. Contrary to some user's advices, the installation of this technological marvel is rather easy (if you are cautious and skilled enough) because you don't have to worry about the notches. I customized one Stratocaster and one Les Paul (w-Bigsby) with this nut. The result is bluffing: perfect alignment, frictionless action, discrete but great look. This roller nut permits you to engage safely in the most aggressive post-Hendrixian vibrato playing.
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