Just finished upgrading my SE Santana to locking Gotoh SG381-01 MG T tuners. I’ve had no real tuning problems since I installed a Graphtech nut, but for additional stability and ease of changing strings, this was a cheap, quick and easy drop in upgrade. Less than 30min and they were in. From the front they look exactly the same as the stock tuners. Post holes sit a little lower, but because you don’t have to wrap the strings, this doesn't alter the break angle much (if at all). Works a treat, highly recommended.