Congrats ...I like the "z" model over the regular T5.
Nothing outside the obvious to look for with these as they are "solid" guitars ...you know what I mean

. Action, playability, no dead/buzzing notes throughout, yada yada.
But beyond the norms, I would absolutely recommend playing plugged in and going through all the pup combinations and using the knobs
more than you normally would within the 45-day window. Electronics are always something to keep an eye on when contemplating a used guitar.
Edward