I've watched it, learned some. Just realize it's a like a paid advertisement. The best teaching tool out there is range time, and being able to store what you've witnessed in that hard drive between your ears.
You may pick up a couple of pointers by purchasing it, like reading mirage, but you will pick this up on your own. Just go shoot some day when you know the wind is going to pick up, shoot before the big blow, and then through it, and remember what happened. Having a friend with the same skill level to learn together will help, but having someone with who's been through it is invaluable!