Eric, good condition is a poorly over used term when someone sells a machine.
Particularly if they are not a machinist or have not operated the machine in question. To them good condition may mean everything moves or it switches on and runs.
Rarely if ever are any spec sheets supplied stating current tolerances, back lash, run-out etc
I've found some machines for sale claiming to have been refurbished only to find out the seller had done the refurbishment using little more than cleaning solvents and spray paint. I have even bought some if the price was right and the paint job was good quality, Knowing that as long as there wasn't too much wrong with it I could scrape square and tighten up where needed and make a decent machine out of it