I remember reading somewhere that if you land it perfectly (as if there was no air bag) it can mess you up pretty good. You are supposed to land a little bit off.
They had one at Windham
Feb 2010: I was enjoying the air bag for my first time, did it like 10 times in a row, and then decided to do ONE more time... threw a 180, landed "perfectly" with my feet down, which meant that as I sunk in, when I fell to one side, my board was stuck into the air bag.
And that is how I sprained my MCL, which has been a continual problem for me / bothered me at least to some degree ever since
Couldn't walk properly for a while after that
If you land on your face or your back or whatever you will be totally fine.