Could not convince myself to spend 600$ for the WT5A and not sure what it can do better then the other wireless Nikon adapters do for 60$.
So I"ve setup a 25$ portable small router and a 1$ ethernet cable to do everything the WT5A can(as far as i can tell) and it works great for me. I send pics to iPad/iPhone wirelessly and can then mirror to AppleTV if I'm inside. I can also control the D4 from the iPad/iPhone. I'm not sure about the range however on the WT5A. I'm getting about 30 feet which is good for me.