looking at the images that accompany the descriptions of each shot I would be worried about the players that may be developed using that model! Each sequence has a fairly fundamental flaw somewhere (extension position on the forehand, or contact position on the two hander for example). Why on earth would you not have technically perfect models in your picture descriptors!?!?
I tweet - @ashtennis guru (no spaces)
I Shoot - www.flickr.com/photos/ashtennis guru/ (again no spaces! grrr)