BTW, I agree with all those who say OTK is better supported (like on a couch or bed) as compared with over a chair. Still, for video purposes, the chair thing works well. Just did a shoot with a long legged model and it was a tad awkward but actually worked quite well for viewing purposes since the cameraman could walk all the way around and get some good closeups.
And soon as I can, I'll get those pics up here (and on my site soon as I figure out this whole Content Management System thing - promise!).