Yeah - it took me 3 - 4 days to get used to them. Forget about perisperhal clarity. You have to actually point your head where you want to see. Not totally happy with that part, but the actual progressive aspect is really neat.
Was at UNOs for lunch yesterday. Table had diamond pattern table cloth. Any tiny glance to the left or right, and the table top would tilt by an inch or two. Even with both of my hands on the table, I couldn't convince the brain that the table wasn't moving. Both disturbing and good fun at the same time!