Guitar in question is hardtail but neck was repurposed from a trem guitar. Disliked the locking nut from day one (rattles, pain to change strings and rather ugly) and when Graph Tech came out with the unlock series, I was very keen to try it out.
Installation reasonably straight forward with just a small bit of flat sanding to fit the neck nicely. Drop of wood glue and clamped over night; ready to go the next day.
Not exactly cheap for a nut but it works well for a locking nut replacement and is easier on the eye.