No, it teaches you how to remain balanced, but I think it is terrible, there`s no weight transfer. There might be some benefit, but I think there are better solutions. If you don`t have balance, you probably won`t ever be good at tennis, and this kind of exercises will not help you if you are not talented. And if you are talented, you do not need it.
The footwork example is good, we had a discussion about this in a recent thread about a month ago. It is where you recover after contact and as you finish, instead of recovering during or after your finish.
But that is a lot of money!
Footwork drills, jump rope, hexagon drills, etc.. will help, I think this guy is trying to help you to be more efficient with your movement more than anything. Let us know if you buy it, how it worked out for you.