Replying to Foam Blocks or Giant Airbag?

I am just wondering, for those that have tried them, what would be better for summer training; using foam blocks as a landing or a giant air bag like the one at one of the camps. I have messed around with the foam blocks before at gymnastics places and you can basically land on you head and have no issues at all. Does the bag hurt if you really screw up? Just wondering... I know Woodward and a few other places use the foam but the bag seems pretty tight. And yes I know they are both very expensive.