Here is the deal - the program worked for me and my chihuahua and has worked for all of my friends that were disciplined enough to train themselves.
I have a chihuahua from a shelter that was mistreated as a pup. We got her around 9 months old. She was not house broken, had major major separation anxiety, and all sorts of issues. Now she is a happy, relaxed dog. I take her for walks off-leash, she will hold a position for hours, comes, sits, stays, drops to a lying position at any distance, backs away from wherever she is, waits, goes to her bed or crate, all by speaking the commands once. A chihuahua! After a week of working with her many of the bad behaviors began to disappear. Once she would go to the down position at a distance and stay there until I released her, most of her other issues corrected themselves. I didn't have to deal with them directly because they were a result of her trying to control me. Once she recognized me as the lead dog so to speak, all the misbehavior stopped. As I said before, this program is only for owners that are willing to learn the program, train themselves (the program is easy to understand, but many of us have bad habits), be consistent, and don't have a problem putting their dog in an appropriate level of discomfort as a correction. What is great about this program is that once you show the dog what to do, train them to do it with praise and correction, you rarely need to correct the dog again.
If you want owning a dog to be a joy, get this program.