I bought a used Gibson SG 1967 8 years ago. It's still my only electric guitar and I've playing it almost daily for all those years. At first nobody wanted to buy the thing cause it had been broken before and wasn't in great shape.

The guy was asking 250 cnd$ for it. I tried it and loved the sound so I bought it. Even thought it's not the best looking guitar the sound is better than a lot of 1000$+ guitar I tried. I bet you could say the same thing about your guitar. I think the price of some guitar is well over what they're worth.

If it sounds good and you feel confortable, you made a good deal.