Hey I know this is an old thread, but I just did a major update on this guitar and I'm really liking the changes: Schaller locking tuners, Joe Barden compensated bridge, and Lollar "special T" bridge pickup. Removed the piezo and all its junk. New controls are the LP switch, independent volumes (like a J-bass), master tone, and series switch.
I found myself never using the SD lil 59 or the piezo - I would go to them, then eventually realize that for any kind of sound I wanted, the P90 could do it better. Never got over the quack of the piezo, and increasingly it bugs me when I hear it live. So now it's set up for slide with Ernie Ball "not even slinky" 12-56s with a garrotte of a .026 plain G.
Now I can get a really nice tele sound out of my tele. Although this is Lollar's strongest tele bridge pup, it's not overhot (7.6 I think) and does clean twangy stuff really well. Am still working with pickup heights to balance the relative volume (neck is a bit louder than bridge), but I have the independent volumes anyhow. But the best part is that in series mode this thing develops a whole new personality, with a great big clear bass and loads of output, a fantastic sound that I'm really liking for slide. The series sound is way more useful than the high-tech piezo thing for sure.
I also highly recommend this bridge - same specs as the callaham but half the price. Very well made, does what it's supposed to, drops right in the W tele rout. Can you tell I'm a happy camper?