Buy it. Think about it. Even if I knew enough about horse training to try it, I suspect my set-up and my riding needs wouldn't be a good match. However, many have had success, and I admire what they have done.
There are two horses in my backyard right now. Neither one behaved ANYTHING when we met like they do now. A few months after buying Mia, I was certain I had made a huge mistake. Two years later, I'd shoot anyone who tried to take her. But there have been rough times in between, and I've had to adjust my goals to match what we can do.