I have cut myself with the die. When I first got my GO and was playing around with it, I picked up a die without thinking about it and my thumb was on a blade. And when you stop and think about it, they cut fabric by pressing the fabric onto the sharp blades. So now I store my dies with the paper they come with, some have the plastic sleeve they came in too.
On some of my dies you can see the blades and I don't run my hands over any of the dies because even though the foam is there it doesn't take much pressure to expose the blades. You should go on to their website and check out the FAQ's or write them and ask.