I'm relatively new to telecasters with the purchase of a CV tele and a dimarzio area t vintage set last year. When I installed the areas, I left in place the original switch and pots. My bride got me a wiring kit for Christmas which included a four way switch and new CTS pots. All I can say is wow. Not only is the fourth position very cool and usable, but all the other positions sound way better than before. It's the proverbial lifting off the blanket. Like "I just got a new set of pickups" different. Ive been at this for twenty something years and I had no idea switches and pots (of the same value) could affect tone so dramatically. Merry Christmas!