If you are in a situation you need multiple wireless APs but can't run ethernet to them (like renting etc), I'd probably pass on a Unifi system personally.
Edit 2: I have eero now. The nodes seem to have some proprietary protocol that sends clients to the best node as you walk around the house. I can’t setup Vlans or do power user stuff, but my WiFi actually “just works” now. I don’t think I’ve touched it once after initial setup.