The extended range battery is a must! If you're flying it in a breeze or up high the processors work even harder and the thing drinks battery even more.
They make custom order shells for $30 and a go pro camera can mount anywhere on it.
Several months later and in the freezing cold the thing is still awesome. Turns heads like a smart too.
I plan to use mine (and a go pro cam) to get aerial shots during the upcoming Midwest rally