I have the Linksys EA7500 router. I have a 2 story home, approx. 3500sq ft. This thing sits upstairs in a foyer and is connected to a Netgear CM600 modem. I have great coverage throughout the house.
I'd love to be able to move my cable drop / router / DTV connection to somewhere more central in the house, but I don't think that's feasible with our open floor plan. That's what is appealing about the Ubiquiti Pro AP - that it can be mounted anywhere as long as I can get a CAT cable to it via the attic / walls. And the mesh network setups just cover everywhere with multiple access points.