Over the years, I've struggled with my own household WiFi, and I recently ran across a bin in my basement of all of the various Linksys, Netgear, extenders, repeaters, powerline equipment, etc. It's always been a struggle to get really good coverage not only throughout the entire home but also the garage and outside, and for outdoor security cameras and all the modern connected devices of a techie home. The mesh WiFi solution has been the first "it just works" experiences that I've had.
Do consider opting for Sonic's whole-home mesh WiFi service. Details at: http://sonic.com/betterwifi