To start with, look at the edge-on photo comparing the X101 to the Macbook Air.
Now, in the graphics editor of your choice, re-colour that battery step at the back of the X101 in the same colour as the machine itself, rather than (nearly invisible in photos) black.
Suddenly, it's twice as thick! Who'd have guessed? Yes, this machine looks like a Macbook Air competitor, but only because they used a user-removable battery, which means a big hunk'o'plastic sticking out of the underside.
Next, look at the photos of the keyboard layout.
In particular, look at the location and width of the right shift key.
This is a particular beef of mine with Asus -- and most other far eastern vendors: the right shift is the size of a regular letter key and is positioned to the left of the up-arrow. If you're an English-speaking touch-typist you will end up hitting up-arrow half the time when you mean to type a capital letter from the left side of the QWERTY block. (I suspect Chinese, Korean, and Japanese keyboard mappings ignore the right shift key, hence it tends to be deprecated by designers who don't do their usability testing on American or European users.)
Upshot: it looks gorgeous (especially for $200!) at first glance, but I'm pretty sure it would drive me insane within half an hour if I had to actually do any typing on it. Regardless of operating system.