I'm reading some reviews and this is just… plain horrible:The OnHub only gives you a single SSID for both 2.4GHz and 5GHz bands. Most routers still let you assign different SSIDs to your networks if you want to. And it’s worth doing; routers don’t always do a great job at picking the best band for you, especially at long range. The OnHub bumped us down to what appeared to be a 2.4GHz connection at the far end of the router’s range but didn’t appear to switch back to a faster 5GHz connection when our laptop moved much closer.
How the hell can a router do that? This isn't LTE with CSFB, this is Wi-Fi. There is no mechanism for the access point to tell a client to switch to a different range; for all intents and purposes they're completely different physical networks and the only similarity is the authentication/authorisation requirements. A client connects to the first network that broadcasts its SSID. There's no way for an AP to “switch” a client “down” to 2.4 GHz unless it shuts down the transceiver for the 5 GHz band for long enough for the client to look for the 2.4 GHz network. Same with going from 2.4 to 5 GHz.
How can the AP even tell if the client supports both frequencies?
Review in question: http://thewirecutter.com/reviews/best-wi-fi-router/#competition