I think it's a great Idea. I plan to have one at my wedding. i've seen ones where it prints out two strips, the people in the picture keep one and the bride and groom get one for their scrap book.
I love it!
There would be loads of tears. and yeah, i would probably throw up as well. And then there would be a detour to a mall or something to buy a cute white dress or something to make it look like the original plan was to change into something cute for the reception.