Somebody stop me

I've got a line on a Buddy with a 14" Z axis for a bit over $4k; unfortunately, it is presently disassembled, stacked in a trailer, supposedly in a shop. They say they may deliver, assemble, and test it, but I'm inclined to have it assembled right where it is, test it first. I'm unfamiliar with this machine- what aspects deserve special scrutiny or commonly fail?

I suppose I would rather pay twice as much for a well maintained and performing machine, but might tolerate renovating, if not a nightmare. What do ya reckon?