A mesh router is the perfect solution for better Wi-Fi coverage in large homes, especially if you're dealing with dead zones.
Here's a quick overview of modems and routers, how they work together to bring you wireless connectivity and why they're best kept separate.
While it can theoretically do some good on very crowded networks, Netgear's QoS protocol can also create more problems than it solves.
The Wi-Fi protocol MU-MIMO offers a lot of potential, but it appears to be at least a year away from widespread implementation.
Even though you have our general recommendations, you should still understand the features you're likely to find in your router, and what they do.