This is off topic but since it was already opened up, I have an RT-AC66R and I love it. Best router I have ever owned. It runs circles around my old Linksys dual band router. I don't have any .11ac devices but since this was $30 over the RT-N66R I figured I would build a bit of a buffer in for future equipment I will own. The wireless distance is fantastic, even the 5GHz distance! I love it.
i was thinking about grabbing this also as I am one to stay on top of the tech, but things working so well now with n56. best router I have ever owned... yet still I may take the plunge just because.