This "wifi mesh" technology sounds like wireless repeaters. Perhaps they are just pre-configured wifi repeaters for customers?
Repeaters do exactly the same thing. Share the same SSID and password, wireless devices would seamlessly connect to the nearest repeater with strongest signal.
Perhaps some networking experts here can share some insights.
Wifi mesh is not wireless repeater. Each wireless repeater comes with 1 SSID. If you say you gonna put the same SSID for more than 1 repeater, then your device will be confused if one RSSI is weaker or stronger. Moreover, repeaters have a huge wireless backhaul nearky half its wireless ability each time it hops.
Wifi mesh is therefore able to extend coverage with lower wireless backhaul, comes in a pair of nodes per package and is capable of connecting more nodes together to form a large "net" of wireless coverage. You just need 1 SSID and when u move about, the nearest node to you will take over the service by handing the clients seamlessly across the nodes with no drop in connectivity.
Moreover, which repeater can broadcast the dual bands simultaneously? Singtel wifi mesh, made by AirTies is capable of broadcasting both 2.4 and 5ghz concurrently.
Wireless repeaters, usually less than 100 dollars and you can get it at as low as 39 dollars. Wifi mesh however, is never sold on such a low price. Look at eero, selling at 600+ when converted to sgd..