I am well aware of those other machines. I'd have been more interested to hear your opinion on the MacBook (you know, the machine this thread is about), but I suppose a patronising comment which adds nothing to the discussion is just as easy.
Thanks for your contribution.
You want my opinion on it? It's more akin to an iPad. It's for people that value portability and lightness above all else. And I think Apple's ultimate goal is to get rid of the MBA and replace it with thinner and lighter rMBPs. So you'll have rMB for general consumers and rMBP for prosumers/professionals.