Lots of people swear by their MBA 11" being an excellent ultraportable solution. And you think that a Surface Pro 2 or equivalent Windows 8.1 tablet wouldn’t cut it? Why? It’s the same screen size, only that the Windows tablets come with a higher resolution (i.e. more display real estate), a touch screen and a digitizer, which make handling tiny details a lot easier. Not to mention that, for example, Sonar is already multi-touch friendly and I’m sure other DAW’s will soon follow.