We don't have the DVD but I have taken all of John Walsh's tips, from various sources and taught them to my children. I'm going to check out the DVD now. I admire John Walsh, what a great man.
We have the DVD and my boys enjoy it. It is geared more toward younger kids. I would say the 3 - 8 crowd would get the most out of it. We watched it alot when we first got it and now it gets watched every couple of weeks. My kids have learned and retained some of the things in the DVD. We actually bought two extra copies and donated one to preschool and the other to the elementary school my older DS attends.