I have no plans of buying a folio case. It adds weight and thickness to the device and makes the kick stand useless. You also cannot enjoy the beauty of the vapor mg casing. I personally feel the vapor mag already acts as a durable case. The case also will trap in more heat, which is especially a concern since the surface pro gets warm thanks to its i5 cpu. I believe these devices are really built solid and durable. Just be more careful not to drop / scratch it. I use my old case for 10 inch netbooks and it fits perfect. Even fits my Bluetooth keyboard, charger, mouse, and it has a shoulder strap and doesn't look bulky.
If you really want a case, look for one designed only for the pro and not the RT. I have seen some cases apparently built for both devices, but I wouldn't trust it since both devices have different thickness.