I also consider same issue as yours before I go for AC PRO, say need give up Draytek central management. But actually I'm not a expert user, what I need is good wi-fi signal coverage done by single AP & a "fancy" outlook of course.
I won't say 910c is not good. I can tell I wait for 910c when I know it will release soon. But after consider the pricing/spec factors. I made my decision!!!