mehhh,
I first read these books when I was about 10 years old, and I was totally enchanted by the way Amy could work with horses, and the way she trained with natural methods, using herbs and alternative therapy.
Now being 15 years old, and training my own horses using alternative training methods and herbs, I see many things wrong and vague with these books.
Lauren Brooke has made it seem that all you need to do to train a horse is "ask" politely (using words!), give it a rub of this and drop of that, chase it around a round pen, stick it in its stall, and voila, cured horse! Horse training is SOOOOO not like that. Horses are not people!
While herbs are very helpful, and so is round pen work (all though you don't just get join up by chasing a horse with a lead rope, it takes way more finesse and technique than that), Amy never does the absolute obvious with problem horses. She rarely has a vet check to rule out any pain, and saddle and/or bit fitting have never been mentioned in any of the books. Those two things are absolutely KEY in working with a problem horse. First you have to rule out any outside pain!
What I'm worried about with these books is that little horse loving girls will go out and get a pony, and try to train it using the methods in these books. But, because they're so vague, they will ultimately fail, and have a very messed up, angry or fearful horse on their hands. I know this, because I was one of those girls. I took an abused 2 year old filly, and attempted to train her using these books. It did not end well, and if I had not found a wonderful, classically trained mentor to teach me, my parents would have sold my horse to slaughter, because she had become too dangerous. I have also helped horses of people I go to school with, who have attempted to train horses from story books, and failed.
These books are not all bad. They are a great 1-2 hour read if you want drama and a sob story. They show that there are alternative ways to train and work with horses, and that you don't have to use a crop all the time. However, the absolute simplicity of these books can lead young (and even older) wanna be trainers into trouble, because they don't show how horse training really is, or how it is done.
That's my story and I'm sticking to it ;)