The magic of this convertible is that people who can't live without a keyboard will find the ability to quickly convert the Yoga into a full-fledged, no compromise laptop indispensable - particularly given how great the keyboard it is.
We initially feared that we'd dislike how the keyboard felt when folded below the screen in tablet mode because in this mode, you're essentially gripping the keyboard on the back of the tablet. Aesthetically, it does look a little weird.
However, because of its size, this is not the kind of tablet you'll hold in your hands for long stretches of time. More often than not, it's just resting on your lap. If you really have a problem with this, Lenovo sells a $40 sleeve that you can tuck the bottom half of the Yoga into.
In any case, the keyboard shuts off when it is folded behind the screen - and in the other two non-laptop modes.
All this said, as far as tablet experiences go, the high-quality display makes the Yoga a joy to use in this mode. It's worth noting that, given its screen size, this is not a device that you'll be using much in portrait mode.
(Confession time: I'm still occasionally blown away by the fact that I'm holding a screen in my lap that is the same size as the TV I had in my college dorm room in 1992.)
How does the Yoga compare to the non-Retina 13-inch MacBook Air? Pretty favorably. Operating systems notwithstanding, the two systems are virtually identical, except that the Yoga has a 1600 x 900 display while the MacBook Air has a 1440 x 900 display. The MacBook Air also has a 512GB solid state storage option, while the Yoga currently only goes to 256GB storage.
The MacBook Air, of course, does not have a hinge that allows you to fold the keyboard behind the screen.