Just thought I'd share my experience buying a used '02 Sundance Altamar on Craigslist recently...
They were the original owners and the tub had been sitting in the same place since day 1.
In a sunken patio with a deck overhead. The sun had never hit any part of this tub.
Due to their increased time away from home, they hired someone to winterize it (or so they thought) a couple years ago.
They were very accomodating and filled up the tub so I could inspect it thoroughly.
The heater turned out to have a crack (not completely blown out and water was left in the heater, turned to ice and cracked the casing) and they promptly called out a tech to install a new one ($500.00).
It turned out pump #1 had a small leak and a seal was replaced.
They kept the tub full and running for 2 weeks so I could wet test it and then have a final inspection prior to moving.
The tub is in literally "like new" condition.
Price was $2,000 with a brand new heater and the circ pump just 2 years old.
I've been told the price was more than fair.
Does this tub have every single feature I wanted in a spa? No, but how long would I have to wait to find one for sale
from sellers who are completely honest and willing to make repairs to the tub prior to the sale?
I would not buy used tub that is not up and running for at least 7 days.
If there are any issues with the tub, the owners should fix the tub or adjust the price accordingly.
If the price is not significantly lower than "new with warranty", I would not buy it.
Just my 2 cents...
Good Luck