I'm also going to chime in on this and say it is definitely not Zero consequences... they have one installed at Windham here in NY and it is definitely fun to launch yourself and try grabs and spins you would never consider trying otherwise. That said I've seen some pretty gnarly accidents on that thing. One of the first times I was up there after it was installed, I watched someone come in too hot and launch themselves off the back of the bag. Another time there was still a person trying to get off the bag and they still let someone take off and the person trying to get off got shot off the edge of the thing.
Still even with that it's a sick experience and definitely worth the extra cost. Just don't be stupid and you'll be fine.