Now that I have two devices in my home that support 802.11ac, I think it's time to upgrade my wireless router.
My current setup uses a Buffalo WZR-HP-G300NH running OpenWRT with wireless disabled as a wired router, and a first-generation Apple Time Capsule as the wireless access point. This has worked great - I think I've only needed to reboot the Time Capsule once in 6 years (disregarding the time the power supply failed and I needed to hack a new power supply into it).
Given that I use a wired router, I don't really care much about the routing aspects of whatever router I buy - although it would be nice to have good routing in case I decide to switch in the future, I'm most interested in wireless performance and reliability.
Unfortunately, the reviews on consumer AC routers do not fill me with confidence that they'll "just keep working" once I've set them up. Tri-band would be nice but not a deal-breaker. But most important is reliability.