I have the Google WiFi. Costco has a pretty good priced bundle with 4 nodes. I was really leery of it at first (being Google and all) but after putting in my own DNS server, it's been rock solid.
You have two choices how to use it:
As a router - where it connects to your cablemodem and manages the network. Or you can run it in "bridged mode" where it just adds itself to your home network meshing seamlessly with your wired networked equipment and existing router.