I don't know! I really like the phase I tuners and really didn't like the phase 2 at all. Just seemed lower quality to me. There again, I do like Grovers on Les Paul so like heavy tuners. Phase 1s seem very well made and work very smoothly. The ratio may take some getting used to but try tuning a violin! But if you google search almost everyone hates them with a vengeance! I don't understand it. I find using the wing locks also very easy and fast to use. Very fast to change strings and never go out of tune. All of my PRS have them on at the moment.