I've sold more gear this year than bought.......... I think.
Best has to be my Squier jazz which I've done a few bits to.
Different tuners, I've taken the shine off the poly finish, changed a capacitor and the pickguard and added a badass bridge.
I seem to be going down a moddy kind of route at the moment.
Worst thing was easily a Yamaha BB735a. I literally picked it up from the vendor and knew it was gone.
I know this is sacrilege to many on here but I don't play in a band anymore and it just sounded insipid to me and was just a big lump with a flat fretboard.