Bought 2 pair of these a few days ago. Did the acid test last night at a dark restaurant. Popping the glasses out of their little case elicited the desired "oohs & ahhs", and they stayed on my nose without having to readjust every couple seconds. Getting them back in the case without fingerprints is a little tough, but I'm sure it just takes practice. Also, make sure not to push in and down on the little retractor button, or else it sticks. Just pull it down with a fingernail, and it works fine.
Definitely going to put a couple more pair on my list of stuff to just have laying around. Also, great for gifts for your nearsighted friends!