Replaced the stock tuners on an Epiphone SG Special with these Gotoh locking tuners and was really impressed by the result. Great quality. The tuning stability has increased significantly, fine tuning is a lot easier and quicker now and restringing is much faster.
(A note for the specific guitar model (Made in Indonesia, Epiphone SG Special 2010): the stock tuners have the mounting screws placed diagonally, so you need to place the new tuners and drill pilot holes for the new mounting screws. Also the peg holes in this guitar are 8mm diameter. The Gotoh bushings that are included are 8.8mm. So, you either need to ream a bit the peg holes or leave the stock bushings.)