So I just replaced my wifi network last week. I had a system of 4 Airport Extremes (802.11ac models) and used ethernet for the backhaul.
I ended up replacing them all with an Orbi wifi 6E mesh system (base plus two satellites). Going with the 6E model added a substantial amount to the price, but given how long I'd owned the Airports, I figured the 6E system would be good for a while.
Even letting the satellites use the wifi backhaul (a separate dedicated 5GHz channel), I've gotten as high as 629Mbit/sec on my M1 iPad Pro. That's more than twice the speed I was getting from the old Airports. And while I've got ethernet going to a lot of rooms, there's a couple that don't have ethernet going to them, one of which is a perfect location for one of the satellites to improve wifi coverage and fill-in some of the signal gaps my old Airport network had. So even using the wifi backhaul I'm getting better speeds and coverage than I was using ethernet backhauls on the old Airports.
The Orbi also has a couple additional features like an IoT network (a 2.4GHz only band) and a guest network, neither of which I really intend to use.
System packaging was good and it the satellites came pre-paired with the basestation out of the box, so set up was extremely easy. I did have to dig into the settings to switch the Orbi into Access Point (bridge) mode instead of "router" mode, as otherwise I'd have a double NAT situation which I didn't want to have to deal with, but had done the same to the Apple Airports as well.
The only issue I really had took me a solid day to figure out -- for whatever reason, the 2.4GHz channel that the Orbi selected on the Auto channel mode was causing problems with my Hue lights. I couldn't figure out why some were working and some were very glitchy. I manually switched the 2.4GHz network to channel 1 (was set to "Auto") and the Hue lights began responding again. My Airports, whichever channel they automatically chose, never caused any problems. Either way, it's working well after the 2.4GHz channel change and I'm far enough from my neighbors that I don't need to worry about channel interference from their systems.
I plan on buying my wife a new laptop this summer (likely the 15" MacBook Air, if rumors are to be believed), so she'll be able to take advantage of the 6GHz 6E network.