Make sure to inspect the Cyclone closely. At $500 it should be in excellent shape(and I think clean but that's just me)
Things to check:
Rods straight and chrome not flaking(problem with some Cyclone II's) rods are ~$40 each
Swelling on side/end walls indicating water damage deal killer in my opinion
Is surface perfectly flat and damage free laminate adhesive can dry out not common but can happen .. probably deal killer.
Laminate issues on outside of cabinet are much more common....not deal killer but would not pay $500
Shopteacher was being diplomatic on shelti I think...with damage like that looks like a parts table
FYI.
$500 is the absolute top because you have a decent shot of finding coin-op of similar vintage with minor cosmetic issues $400-$600 range. So at $500 I think it should be "show room" condition