I've just bought this to replace a failed Netgear dual band router and I am most disappointed.
It is clear that certain Apple products will not 'see' the Internet when connected wirelessly to the Archer C7 using 5Ghz with AES encryption enabled.
In my house,
These devices connect and can 'see' the Internet: Apple TV, iPad mini, iPhone5, iPad air, Samsung Ultrabook (Windows 8.1)
These devices connect but CANNOT 'see' the Internet: MacBook Pro Retina 13" (Bootcamp - Windows 7 64bit), MacBook Pro Retina 15" (Mac OSX Mavericks), iPad 2
Researching the issue, I'm clearly not alone with these problems and the common factor appears to be devices containing specific chipsets (Broadcom). Installing the latest firmware from TP-LINK (3.13.11 130729) does not fix.
Workarounds include switching to TKIP encryption (but this severely hampers speed) or switching off encryption and using MAC address filtering to control access but the LATTER IS NOT ADVISED for reasons of security.
Of course, one could just use 2.4Ghz which appears to have no issues but that's not why I bought a dual band router!
So until TP-LINK and/or Broadcom release firmware updates to resolve this, it appears that 5Ghz wifi is going to be an issue for some people with some devices. I'm debating whether to return immediately or hold out for a fix. I've written to TP-LINK to ask them why they don't appear to test their products properly before selling them and why they are dragging their feet releasing a fix. I will post again if I get anything useful to pass on.