I used to take lessons long ago, longer than i'd care to admit, and the guy who taught me owned 2 of them.
I think one was a 700 though, but both of them played and sounded absolutely excellent as I recall.
He swore by them. He sold Les Pauls and Sg's but kept those two Yamahas. I remember him telling me he owned a few Kramers in the 80s but ended up selling those too. His main Yamaha went through like 3 refrets or something crazy.
Like I said, that was a while ago, but I'd be willing to bet he's still got those old yamahas kicking around.
Isn't that the guitar Carlos played on the "Moonflower" tracks?
My favorite work (and tone) from Santana.
The only potential negative I have heard about these guitars over the years is that some of them tend to be on the heavy side. Otherwise, they seem to be tone machines.
Great guitars whether it be a 500,700,800,1000,1500,2000,2100 or 3000. Funnily enough I compared my mates LP custom against my SG and the LP was heavier... nothing that a good 3" Levi's or similar strap can't overcome!