Tsang, I think it is quite fair indeed to compare the use of Surface to the Mac Book because, for one, Microsoft does, and for two, most all tech bloggers (who are nearly all MBA users) do it all the time. That said, I also agree with the rest of your comment. Most people who make the substantial investment required to own a MBA won't quickly swap it out for a Surface. What the Surface Pro 3 does is provide a credible alternative to the MBA that is actually more capable and as you say, it is new users who will purchase the Surface. We have to remember Surface has a particular mission for Microsoft: to show what is possible and to be profitable. They want the device to be successful and inspire the OEMs but not hurt these partners.