I have been working on my S900 Yamaha for more than four months and I am still discovering new things. The keyboard keeps getting better as I learn more about it. It was just OK just out-of-the-box, now I am finding ways to do whatever I want and the keyboard sounds great.
Dom, with all respect two weeks of dedicated work will not reveal all the possibilities of a keyboard, although you would have the answers to your personal needs.

My opinion, John C.