I've owned a few over the years. My first one was the best. He would be considered a foundation App. Tucker was a bay roan, with white blanket over the hips with big black spots. He had sparse mane and short gray tail. It wasn't sparse, but it never got past his hocks. That horse would do anything I asked of him, and with me being 16, there wasn't too much we didn't go through, over or under. He was also a shuffler. We would have to start out toward the back of a trail ride because we always ended up at the front before it was half over. Smoothest ride you've ever been on.
I will be horse shopping within the year and what I wouldn't give to find another like that.
I've also had a couple nutcases. I don't think its the breed/color that does it, just the horse itself. Not all people are sane, same goes with horses.