I've been using the beta firmware for a couple of months with 2x AC68Us, the primary as an AP and the secondary as a node, both with wired backhaul to my main switch. It's worked flawlessly, in at least that I can never tell it's working (or not). That is, all I see on a daily basis is great wifi coverage and speed.
As I type this I'm updating to the official, non-beta firmware. Let's hope my luck holds!
As I type this I'm updating to the official, non-beta firmware. Let's hope my luck holds!