The only problem with these mesh Wi-Fi systems is that they all have minimal Ethernet ports. In this case, the boosters don't have Ethernet. I use an Apple AirPort system now (due for an upgrade,) and the fact that the AirPort Express boosters have an Ethernet is wonderful. I have a networked LaserJet printer that I use that unfortunately doesn't support WPA2, so it won't connect to my properly-secured WiFi network. So I use the Ethernet jack on my AP Express to connect it. (I also have a bookshelf stereo system with really good speakers there, so I use the AP Express' optical audio out jack for AirPlay to it.)
With these mesh systems, I'd have to move my laser printer. Not to mention, I'd just prefer to have things wired when they're all together next to an access point, to save Wi-Fi interference. (In my home theater setup where my modem is, there are eight devices that connect to the internet, six of them have Ethernet jacks. My AirPort Extreme base station currently feeds four of them by Ethernet, but I'd rather have them all Ethernet to save Wi-Fi bandwidth/interference potential for the Wi-Fi-only devices. (Heck, I might get a USB Ethernet adapter for my Switch so it doesn't use Wi-Fi when docked, too.)
At this point, I'm looking at an ASUS RT-AX88U as my "core router" and their GT-AX11000 as "booster" in the kid's room on the other side of the house (with one Ethernet to the kid's gaming PC, the other Ethernet running through the floor to my home office underneath, including the 2.5G Ethernet to my home server.) It's annoying, the "gaming" GT-AX11000 looks like it would be better as the core router, but it doesn't have enough Ethernet ports to live in the home theater setup the way I'd prefer, and having the 2.5G Ethernet near my home server would be preferred. (As it has a 10G Ethernet port.)
And Asus has a "mesh" set of boosters coming out later this year, if I want better higher-speed coverage down the road.