Hi Folks, I have purchased the following products for testing. I will test it for myself, on my kids (they are ages 7,5,3) and some Seniors. Trying to get a variety of players. I will let a variety of players use them to see what they say. Anywhere from Nationally ranked Juniors to the social tennis player. - Tennis Practice Hit and Tennis Practice Hit Plus http://practicehit.com/index.htm - 8 board by Grail Sport http://www.8board.com/_media/movies/video_clips.html I have heard a lot about these but have never tried them. Because I haven't tried them I can't say if the learning will transfer to the court! whic is what we all want. anyway, give me about a month to test them and provide my insight to them.