Check out this simulation of the way FJ works (I don't know for certain but I believe I've posted this before and other people have confirmed it's accurate):
The maneuver starting at about 1:02 is why I won't be riding FJ--I have the kind of vertigo caused by loose particles in your ear canal, and I don't feel like getting them all shaken up.
Based on anecdotal reports, also won't be riding Simpsons. I'm going in about ten days and taking bonine, will report back.