He's good in person seller, I've never seen a bad item from him of the graphs I know. His Gwen's, Beckinsale's, Salma Hayek's and Joan Jett's are all good.
I think this is the site of long time in person collector John Brennen whose stuff is authentic -- but as for the music stuff he is listing on eBay it's WAY overpriced -- not even close to what things actually sell for.