I never heard of those DVD's but when we went I just showed my DD2 the planning video from Disney. And we kept going on the WWD website and I showed her all the rides she could go on. They let you shoot at things just like you are on the Buzz ride. I think it really helped. She would watch the fireworks. She knew before we went that she would see Wishes over the Castle. So when we got there she was really prepared for everything. She knew more than my DH... about which rides she was going on.
I would save the $100 because every penny counts once you are there Good luck
Have a great trip!!!