i took it last summer ('02 6R) and it was kind of a let-down... don't get me wrong, they teach a bunch of really good stuff and try to reinforce good habits:
* get it upright THEN hard on the brakes
* keep your eyes up (fixation, etc)
* balance
* clutch / throttle control
* braking
* smoothness
* picking and holding a line
but a lot of it is just idling around a parking lot learning parking-lot speed manuevers... i'd have liked some more medium-speed stuff. it's good place to test frame-sliders actually... tight turns, low low speeds, i'm actually surprised i didn't drop my bike, looking back on it. it was all full-dress Harleys (one lady did drop hers), a Gold Wing, and me. the wing looked like a good time actually, maybe when i'm old...
if you take it, bring eyewear and an open-face helmet if you have one, it's a real hassle (and hot) to have a full-face helmet on and closed all evening. oh, and i'd just show up if they're full, most of the time it's 1st-come, 1st-served for no-show spots.
hth,
a.s.