We have a single asus flip, that is a loaner and students like using it (I think there is something visceral about using your fingers on the glass of all capacitive touch devices)
iPearl/mcover does make a hard shell for that model.
It does provide SOME protection when the device is in tent or tablet configuration.
they do have one for the R11 (not 'great' protection of course)
Everyone, hard shells make a huge difference in the rate of damage and are ( IMHO ) well worth the cost (as low as $15).
You can trial a free one here