On the one hand this is brilliant and a good 'rebuttal' to the expensive textbook market. I think that this style works particularily well with subjects such as

On the one hand this is brilliant and a good 'rebuttal' to the expensive textbook market. I think that this style works particularily well with subjects such as Maths where there is little to no disagreement or controversy on the subject matter taught (unlike say biology in the USA). But that raises a concern of mine, where every school creates their own textbook, they are free to include their own side or angle of a particular topic, much to the detriment of their students. Sure this can be done in the current situation, but I would wager it would be easier to get experts to review one or a handful of textbooks rather than one for every school. Maybe some sort of cooperative organisation is what is required here, to share the best of the cooperatively created textbooks around.