Re: Costco spa
Looks interesting. However, relatively short warranty. I would question the reliability of the programable jet sequences. They call the air blower a pump, a little deceptive.
The good thing about Costco is you can send it back. We have had 3 customers in the last few months who have told us they sent spas back to Costco because it was costing them from $100 to $300/month to operate.
Re: Vanguard
Depending on the package, your dealer price seems about right.