Updated - D-Link's DIR-882 AC2600 MU-MIMO Wi-Fi Router is a surprisingly good router for the money.
Edimax' Gemini RE11 AC1200 Dual-Band Home Wi-Fi Roaming Kit takes a different, and cheaper, approach to building a mesh wireless network.
NETGEAR's EX6150 AC1200 WiFi Range Extender earns a top performance rating, but has some quirks worth noting.
There's a lot to like about Linksys's RE6700 AC1200 AMPLIFY Dual-Band Wi-Fi Range Extender.
Linksys's RE6500 AC1200 MAX Wi-Fi Range Extender would not be our first choice for an AC1200 class wireless extender.
D-Link's DAP-1520 Wi-Fi AC750 Dual Band Range Extender uses a different approach than we've previously seen for simultaneous dual-band wireless extension.