Well, needless to say the saw came home with me. But here's the rest of the story......
When I got there the guy selling it (late 30's I guess) met me at his parents house, where the saw was. They had it out in the driveway. It looked like it was brand new, no marks on the saw top at all
The guy selling it told me he bought it to do craft shows, but couldn't get the saw to "cut right" so he put it in the garage and bought a new Dewalt 788. He got the saw from an older lady who told him her husband bought it new, used it for about a month then passed, it had been setting in the shop since then.
First thing I checked was the triangle piece (pic) to ensure the corners were still sharp, not rounded, thanks @OCtoolguy for that. As you can see it's looks new to me.
All plugged in, took me a bit to get the blade in the lower mount, got it in there, applied the tension lever, turned it on. The thing took off about a gazillion miles an hour, things were slapping and making noise like it was flying apart.
I'm glad I spent last night watching videos on this saw as I knew immediately it was way out of adjustment. So I released the front tension, adjusted the rear tension, it was way off!. Speed was full on fast, turned that down to just up from the slowest setting. Rear tension set, front tension set, turned it on....
Like a different saw, turned the speed up to about 1000 ram's and what a real pleasure. Extremely quiet, the "mom" commented it was quiter than her sewing machine. The guy selling it said "wow" it never ran like that.
So, I turned it off, paid the guy and loaded it up! Smiling all the way home.