Well, since everyone seems to be saying they're not a fan, I'll just add that I think it's great. Then again, I'm familiar with linear algebra, error functions,

Well, since everyone seems to be saying they're not a fan, I'll just add that I think it's great. Then again, I'm familiar with linear algebra, error functions, etc so maybe the writer is writing for a specific type of reader with a specific background. In spite of being familiar with the material, I still quite enjoy reading how other people explain these things.