If you get a tremendous upset you'll revert to a form of alternate law to aid in recovery (yaw damper available in that case). The loss of both FACs will also revert the aircraft into alternate law (sans yaw damper)... that's how people in sim world put the aircraft into alternate law for stall demos and such.

The aircraft is extremely stable, so you really don't notice the loss of the yaw damper. I've had it in alternate via turning off both FACs in the real thing, and subsequently in direct when dropping the landing gear. The aircraft is twitchier due to the direct control of the ailerons in alternate law, but pitch control is the normal feel. Direct law is noticeably twitchy due to the direct control of all surfaces.