Just for the record. I have iPad1-3, Nexus 7 and RT. RT beats iPad and Nexus in productivity. It all comes down to what you expect of your machine. Ok, Office RT is not a full fat Office suite, but it does a good job for me and, I suspect, most people out there.
I have upgraded my machines I mostly use to Windows 8 since its launch (having tried Pre-release). For desktop, if you learn the short cut keys and set the desktop properly, it is very usable. I don't think I am missing Windows 7.