I picked up the competitor, the Asus version WRT-AC68R. I doubt there is a lot of difference between the two.
I too noticed better wireless range, both on the 2.4Ghz and 5.0G ranges.
I had just swapped the wireless mini pcie card in my laptop to one that supports 802.11ac - and that's where I noticed the biggest difference.
I transfer photos from my laptop to the server via wireless (for convenience, sitting on the couch) and that is now as fast as wired.
Also my phone supports 802.11ac and using speedtest, I am no longer limited by wireless speed - getting the full bandwidth provided by Comcrap.
57M down, 12M up.
Plus I now have all sorts of cool options for QOS, traffic shaping, monitoring, etc.