If someone has an injury that prevents them from doing the traditional exercise, Swiss Ball press movements
ARE viable options as it recruits stablizers that are not always challenged using the traditional lift.
I will agree that the squat on the ball is extreme and dangerous, but, I don't know why some of you are so close minded to options. As you get older, you train smarter, not harder.
I don't advocate using just your standard garden variety Swiss Ball though as I've seen one burst under the weight of a training partner who weighed 240 who was DB pressing the 60's on a warmup. This is the only way to go. It's burst resistant to 2,000 lbs:
http://www.power-systems.com/p-3354-power-versaball-r.aspxHere's 275, flat bench, on a ball and I was about 185, clean at 5'8. I had arthroscopic surgery in 2000 and this was in '04 if I remember correctly. Don't limit yourself because something looks weird or out of place, it may be beneficial to add to your program on occasion. Just something to ponder.