I just got the Counting & Probability and it does starts very simple as well but in this programs defense if one wants to teach such subjects correctly it's best to start thinking in the correct way at the beginning. Counting can seem deceptively simple but it really is a very complex problem mathematically. That is probably what is going on with the Geometry book.
The books do seem to have a 'Conversational' tone and that is why I perceive them as likely to work with young mathematicians. I have yet to see what my teen thinks about them yet. I don't as of yet have a good idea how they work.
