Notso Fantastic,
Your comparing apples and oranges using the 747 upper deck. The 747 upper deck slide has to deal with maybe 30 at the most people while the A380 will have to deal with over 200 through 3 doors. If you do the math every person on the upper deck has to get from their seat to the door and down the slide in 1.3 seconds. Since you can't see the bottom of the slide you can't see the person that has tripped and fallen so you careen into the back of them. Right after that, the 350 heffer that was in line behind uses you as a spring board.
It is going to be a real challenge to certify this thing without hurting somebody.
And your comments about the designers knowing what they are doing.... I would say they are on uncharted territory because this is the first double decker commercial aircraft of its size.
