The other major rationalization argument supporting THIS laptop vs. Air or MBP is many variations of "light computing", which is often defined as browsing with Safari, checking emails, writing simple documents, etc... all of which can be done pretty easily with an iPad or an iPad with keyboard.
To rationalize the need for OS X will usually meaning needing a bit more power or more powerful apps than what you can do with iOS apps. And as we crank up the need for power, we start cutting into the concept of "underpowered/overpriced". That's why some of us are struggling to "get" this particular offering:
So then we try to find where this fits in (well). And this is harder to do than normal because all of the good alternatives are all Apple products too.
- If you need some OS X horsepower, you can save some money with the Air and get the exact same (full use of) OS X
- If you need more power, you can also buy a rMBP for about the same or less
- If you need thinner & lighter, you can buy an iPad or an iPad with keyboard for about half as thin and half the weight
Is this for some people? Sure. Those who value thinnest & lightest over just about everything else and absolutely want a laptop can get that with this laptop.
I don't know how many people have tried to do real work on Word and Excel docs on an iPad. I did after Superstorm Sandy took out all of our utilities (and yes, I had my Apple BT keyboard). It was a horrible and very unproductive experience. Maybe other people can make it work, but I have actually done it and it didn't work for me or the people I work with.