What I love about Mesh is that it uses intelligence to do what I use to set up manually with pretty big negatives. I use to segment our network to isolate some traffic like the gaming traffic. The problem is some things want a flat network. A long time ago we had these things called brouters which is really what is needed.

The Mesh is incredible because on the fly it figures out what traffic should be kept local and at the same time makes our network appear flat. It is like having your cake and getting to eat it too.

But the best part is setting it up is stupid simple. It is crazy how simple. It is also dynamic instead of the way I set up is obviously static. This is the best thing to happen to home networks in a very long time. It basically goes a level below IP to optimize your network traffic using intelligence and dynamically.

Even if only need one node I would buy Mesh so then in the future you can just add as needed.

I highly recommend the Google WiFi but if have AirPort hardware I would replace it with something. There was a huge security vulnerability with the Broadcom SoC found in April this year and the last patch we received for the AirPort was 7.7.8 late last year right when Apple ended development. You should NOT be running an insecure network.