I posted this in another thread as well, but would be good to have here for future buyers too:
A single r320 is no match for Asus RT-AC68U in terms of coverage, especially on 2.4Ghz. The ASUS is exponentially faster/better RSSI the longer the distance from them. Spent a day and half testing and observing this. R320 gets faster speeds on 5G when in close proximity.
For my home (not big at all), I have to do 3x R320s to cover what the ASUS was covering, and even though I placed a wall mounted R320s beaming towards backyard via big windows (one wall, and 2 doors less than ASUS location)I still get weaker and slower signal at the edges of my backyard, but it is acceptable. And I am obviously going to have the benefit of 5ghz speeds spread out in bigger area (if roaming doesn't suck), which is the only reason I wanted to change.
Some info for nerds - switch port reports only 4.00 watts power draw most of the time (negotiated 4ptdot3af, class 3); The AP heats up significantly (idle) on the back/labels side (there is a hot spot) - if you are mounting it on ceiling with under insulated attic, that constant heat is going to cause condensation in cold weather. The mounting bracket included in the box is for ceiling tile grid only; They do cell flat bracket, but it isn't neccesarry as it can be ceiling mounted with 2 screws only. Status LEDs can be turned off. Overall design is ugly (WAF is low). Software/UI is not very well organized (for example, there are Radio options in 3 different categories of menus, 802.11v only configurable via CLI from what I found, not enough "i" help tips). So some reading/learning required (not a problem for me). Once getting familiar with it, it's not bad at all.