Several weeks or months ago I read a discussion, probably on Hacker News, and in it somebody recommended a router that fixed all his router problems. Reception was excellent, and it had an option to configure guest access on a separate network, secure from the rest, without much effort.
I don't remember the name of the brand. I believe it had U and Q in it, but I'm not sure. The router itself was round and white, like the Engenius, but as I remember it without the leds. Pricing was about 80 euros for the basic model, and there were pro versions for about 240 euros.
Do you have any idea which router I'm referring to? It could even be Engenius, but I don't find anything about the guest network setup in the reviews.