None.

If I look at the current Windows 8 RT tablets, nothing attracts me. It's highly restricted as to what apps you can run and for now, all apps come through the Microsoft Store.

Durable? If I look for that I find myself back to the Panasonic ToughBook line. It now has a touch tablet.

I fear many are going to get a Surface only to discover every app they own does not run as well as why everyone I know thinks the RT in Windows 8 RT stands for restricted tablet.
Bob