You know, I saw him for the first time in Foster City, CA about eight years ago. I was by myself, and the parent of a child on the spectrum, and relatively new to the diagnosis, and I thought Tony Attwood's conference was great -- I felt like I learned a lot, and that he was really very entertaining at the same time as teaching me much about the world of Asperger's.
Fast forward to a few years ago -- and I took my husband with me to a Tony Attwood Conference. It just wasn't the same. I don't feel like I got anything much out of it, and neither did my husband. I definitely don't think Tony was as entertaining [maybe he was just tired or having an off day], and also, as parents we've read and learned a lot since my first conference, and I guess we both felt like it didn't help us out very much.
I think Tony is great for your first, or early, experience with these type of conferences. I would still recommend seeing him.