MESH ROUTER vs Others for home networking

Do you have the ability to get Ethernet wiring from your router to the locations where you want Wireless Access Points?  If not, you can look at wireless extenders (I'd not recommend those), EthernetOverPower adapters ("cable" your WAPs to the router through the 110V AC line; may or may not be successful at connecting), WAPs that can connect to one other WAP (many of the Ubiquiti devices can) or mesh access points if you need more than two total WAPs and want them to connect wirelessly.

I've been very pleased with the Ubiquiti products.  This is the only mesh product of theirs that I have used: https://unifi-mesh.ui.com/ .

https://www.experts-exchange.com/questions/29187015/live-streaming.html provides some good info about Mesh setups.

802.11s provides the mesh routing of some other standard, like 802.11ac (very fast) packet flow.

I purchased the Orbi Mesh system and love it.  very easy to set up and administer.  I have the base router, a plug in satelite and the Orbi voice.  Works very well.

it might be useful to know why you change your existing gear ... ?

- mesh routers are significantly more expensive
- they theoretically allow to cover larger spaces with less hassle as the signal can jump from item to item. since your existing setup works, you do not really need this
- they simplify the devices configurations as you only get a single apparent wifi hotspot
- they sometimes perform better as they can communicate between devices on dedicated more efficient and less crowded  channels than wifi

that said, chances are a good quality router will have better coverage than your existing airport. possibly MUCH better which would alleviate all needs, your devices already have the configurations for the existing extenders that can be reused ( unless they are some apple-specific brand ? ) so the hassle does not matter, and getting even more bandwidth is hardly useful ( and not guaranteed in any way ) unless your internet speed is better than that or you need fast transfers between devices.

my personal advice would be to buy a reasonably cheap router with a decent wifi coverage, test, reuse existing repeaters if needed. by the time you need more, the technology will have changed and it is likely either none of this mess will be useful or you will decide to link multiple routers with cables.

Thx all for your input.
Filling in the blanks, currently I have:
- Airport Extreme (wifi/router)
- Two Airport Express (to extend the signal)
- One Airport Express (Setup as a Bridge, to give me plug-in ethernet access to an area without wiring)
All worked flawlessly until a month ago, when my main Router/Wifi (the Airport Extreme) failed, and Apple no longer makes them.
I am just as happy paying the $$ to rip out all of those & replace all with whatever is current.