As PRS always claims that Phase II/III will not fit / cannot be installed on a McCarty I went with Gotoh Vintage locking tuners. I would have preferred Phase III, but PTC absolutely refuses to do so. PTC will never tell what magic they actually perform when you order "the rosewood treatment of extreme awesomeness". But afterwards the neck feels extremely awesome indeed.It's like everything we like about a solid rosewood neck gets boosted. The rosewood feels even more silkier, smoother,... than before.