I applied over the website a day after the applications opened, got a phone call last week, and it arrived today!
Now what? Not quite sure, to be honest. I've attached it, and at least I can fit it on while still having the case on. It seems a bit weird that the screws are on the inside, facing you as you look at the screen. But never mind.
Does it work? Well I'm not sure because I still can't get a signal inside my office. I don't know if it should work straight out or if I need to get some sort of software update. I looked at the asus support site and there was nothing there for 'GPS dongle' so I assume that its not necessary and that you just have to have your software up to date (which I think mine is).
Will try it later on outside and report back.