Loads of boards beat an Rpi in performance, that not the killer feature. The Rpi has a thriving aftermarket of hardware, a thriving community maintaining their debian spin, a thriving community of people to do support & outreach, etc. Also, none of that touches on their education presence, the work of the foundation, the raspberry jam sessions they run, the magazine they prop up, etc, etc, etc. Asus need to bring alot more to the table than a quad core rockchip imo.
also: according to
this (thanks
@confusis for the link) This is a not insubstantial effort to maintain over time and the failing of alot of pi clones imo.
EDIT: dont get me wrong i'd love to see this take off and become a thing Asus really cares about over the next few years, im just not convinced they will