I used to be a milltronics service rep in Canada many years ago (15 years ago).
These were not bad units from what I recall. The price seems good. Look at the bedways carefuly, if modest wear, good. If I recall they had a hand lube pump, so if the operator used it, the wear may be negligible. As far as the control, this is as simple as it gets. It's an old DOS based thingy. Check if it has the original disk with it. The original PC was probably a X286 motherboard, so if it's dead, it may not be that big an issue to find something that will run DOS. Other than that, Milltronics is still kicking, and they used to be very helpful. They probably still are. I would make sure that any damaged or suspected wiring is corrected before you power that thing.
BTW tons of milltronics guys on this forum to help.