Is it worth fixing an old spa worth it?

[MatthewTug]

I've noticed there's many conflicting ideas online, so I'm hoping to learn from owners who have actually owned these for a while. Thinking back, is there anything you'd do differently if you were start over today? Real-life insights is usually the most useful.
 
https://southwestspro.livejournal.com/1443.html
 
What's your typical monthly maintenance cost? deefaee