Make sure you update the Killer wifi drivers from the Dell site and not the Killer website. For some reason it disables the adapter on boot until you remove it, wipe the software using the tool provided on their site, then do a fresh install of the wifi drivers from the Dell site.
Dealt with that nightmare for four days before I figured a way out of that vicious circle.
My M11x R2 arrived here at work today so I'm feeling very happy. That feeling will only last a week or so though. I still want a red M11x R3! That's my Holy Grail.
Now Matthew that will be your third M11x?! How can you have AW laptops? One for each room?