KO has great how-tos and examples, no doubt, but I would never put it forward as an example of great documentation, for the single and very large fact that it's utterly lacking in API reference documentation. Where, for instance, can I find a list of the ko.utils.* namespace? How do I release bindings when I dispose of a view? The existing documentation gives me nothing. I'm left googling blogs and stackoverflow answers.

Compare that to http://docs.angularjs.org/api .

Real API documentation would do a lot to dispel the myth that KO is only for small to medium projects.