I was somewhat concerned when I first started flying jumpers when they would open the door on jump run and the airplane would yaw around as the guys released their grip on the right strut and fell off. There is also a big forward CG shift when this happens. You are sitting in there with no more than a loose grasp on a seatbelt which I doubt would hold you in if there was a serious bank or pitch. But after ten or so of these you realize the danger is less than riding along in a typical car. It's just a lot of speed, height, and noise to get used to. Especially noise, the sound of air rushing past the airplane at 150 mph is deafening.

I still get a rise out of doing a 60 degree bank to the right at 115 mph- you can look straight down from two miles up at the ground way below you coming up through the plexiglas. There again it is just the appearance of danger, as the g force pinning you to your seat at that angle would remove any possibility of falling down through the door, but it looks cool. One of the planes has a speed brake, it drops like a rock.