I think they're ugly. And slow. And a bit more complicated than a simple 500 twin needs to be....
But hey, that's me
Worth is relative. Depends on where you are, the demand for that particular model, how much the seller likes the bike, and how much the buyer likes the bike.
I wouldn't pay more than 800 bucks for one, in good condition. Hell, I wouldn't pay anything, to be honest, but if I had to buy one... yeah.