I was quite excited about the new AiMesh features. Many of them were ones I had been looking for - ethernet backhaul, guest network on all nodes, client device binding, etc. As I see it, these are the features that make AiMesh competitive.
Alas, after allowing my 2 AC68Us to update to this firmware, my internet connection with Verizon FIOS service became unstable. The symptom was that the main router, which is connected to the Verizon FIOS Optical Network Terminal (ONT) via Ethernet would randomly lose its connection, after which it would not receive an IP address via DHCP from FIOS, unless I rebooted the ONT (and even then it didn't always work). My laptop, directly connected to the ONT (bypassing the AC68U) worked flawlessly. Nevertheless, Verizon was very patient with me in troubleshooting every angle of the FIOS service and the ONT. In the end, though, after many hours of troubleshooting, including factory resetting and reconfiguring my AC68Us from scratch, switching the routers around (Router became mesh node and vice versa) and reconfiguring again - running with just one router, no mesh, etc., it became clear that this wasn't going to work. I ended up having to revert both AC68Us to 3.0.0.4.385_20633, and reconfiguring to the way they had been before... works great . . . minus the new features, of course.
I do look forward to a future release that doesn't have these compatibility issues.
I'm interested to hear whether anyone else had a similar experience.