I really wanted this to work. I've had 2 ac68us doing what this promises to do, working perfectly for months. Asus merlin, one in router mode, the other AP mode, conected via ethernet. Both routers have same SSID. Its worked great. I can start a call on hangouts, walk across the road (to the other AP), it seamlessly switches mid-call. The only issue is the roaming assistant, works great between access points, but causes connection issues at the edges (not really a problem for me, but for the neighbors).
When I read of an official ASUS mesh, thought it was the way to go. Its much slower, dl speed and ping, I can't create a guest network on the second router, I haven't even tried walking between access points on a wifi phone call. I may be missing something, but this seams like a gimick, doing what these routers can already do, except much less usable.
I couldn't post this in AImesh mode. But I can now that my network is usable again.