I bought this tuning machine after Geoff recommended it. I was looking for good quality tuners to replace the cheap Ping machines that came with my Ramirez del Tiempo. I did the upgrade myself and couldn’t be happier. Now my del Tiempo is just perfect: tuning action is smooth and the strings seem to stay in tune longer. By the way, also following Geoff advice, I bought the Savarez 540J strings and they do make my del Tiempo sound like a concert guitar.