I recently bought a Mex Fender Precision. I’ve changed the electrics, pickup, tuners, string tree & nut. This bass will be the one I’ll use for overseas gigs as don’t want to take my US Precision, but the changes I’ve made are practical. Given I’ll have to detune/tune it after flying I want better tuners & nut, the pickup I’ve changed to a Tonerider as they sound very similar to the Custom Shop 62, and the electrics are now the same spec as the US. I’d say the tuners, nut & electrics are upgrades.