I just got a review version of this router, and had a few problems with it so far.
The first, was that it would randomly disconnect from both wired and wireless clients, every few hours or so. Not sure if this had something to do with me changing my setting to "Smart Connect" "Triband" or not, but it still happened after I turned it on.
The second, was that on my main desktop pc, which is wired ethernet, my download speed is supposed to be around 200mbps, I was getting 20. I couldn't figure it out. I wound up figuring out with tech support, that it looks like one of my ethernet jacks on the router was the issue. We even did a factory reset on it, before we tried just switching the ports, and immediately got my full 200+mps measured from speedtest.net and fast.com.
My wireless speeds after doing a factory reset are thru the roof, being over 200mbps, way faster than my previous router. I have much better range with this router.
The loosing internet connection could also have been attributed to the power cable being in a bad spot on my crowded desk, as it is an L-Shaped male connector at the end, and I could see it just briefly loosing it's connection, but I guess time will tell.
Crossing fingers my router is ok, as I don't have a warranty on the item because it was sent to me as a review copy, and I do not have a direct contact with Asus on it.