I'm not sure I would trust buying expensive used lenses on eBay. I have bought some on B&H with great results, but you never know the seller on eBay. I suppose if they have a good review list then, yeah, maybe so. But yeah, a 60-600mm lens is an intense lens. It's the one lens to rule them all, one lens to find them, one lens to bring them all, and in the darkness, bind them.