I tested out Eero in my home about a month ago. They were easy to set up and did a great job of creating the mesh network. The signal at each spot kind of varied a little, but every spot in my home had coverage.

It was just a test unit though, so I had to give it back. Way back when the Eero was first announced I had preordered it because you could get a significant discount. I eventually cancelled that order because it was just too much money and my Unifi APs were working ok (I wanted to upgrade to 802.11ac).

From what I've seen, I don't see any reason to get the Eero over Google WiFi. It's half again as much for what's basically the same product.

Or, depending on the size of the space you're trying to cover, you could just go with the Google OnHub. It's less expensive, and I've been extremely impressed with its signal strength. It's able to reach every part of my house - including the basement - from the top floor (3 floors total).