In my opinion, Om-Kas-Toe is a pretty OK book. The story is pretty laid back, but exciting at the same time. It was interesting to learn what the Indian tribes had to go through to survive. There where many suspenseful points, that really capture your attention.
That being said, there was a few minor things that bothered me. Sometimes, the book seemed to take on more of a textbook-feel. It seemed like the author threw in a fact here and there that kind of took away from the freshness of the environment. Don't get me wrong, sometimes those little facts are very interesting, and I'll admit that a few of the facts in the book were perfectly necessary. But other times, like when Om-Kas-Toe finds Mammoth Hot Springs, it's like "Oh...okay.". He never goes back to that location in the book ever again. It would have been nice if it was a reoccurring area, like one that he went back to for shelter.
Besides that the book was well made and I would recommend it if you wanted to read it. Once you get into the book, you probably won't notice the little thing because of it's likable characters and intriguing story.