For $375, I would at least have a look at one. After all, a mower doesn't have to be perfect to be functional. I would think that if the main components appear to be decent (PTO shaft, gearbox, pulleys and bearings), then there is no reason why it wouldn't be worth a try - if you're in the market for a finish mower. It's probably just a little of half price of any other new units that I've seen.
That being said, if the gearbox shreds, the bearings toasts, the blades fall off and can only be purchased from a store located in Inner Mongolia that's only open on 5th Tuesday, then maybe it's not worth anything!
Good luck and take care.