You don't have to bounce of just ceilings, you can bounce of the wall to either side of you, or bounce over your shoulder, or even bounce of a person standing alongside if they are wearing something light, just remember when you bounce you may get a colour cast ( of course you may know that allready )
True, you don't have to bounce the flash off a card attached to the flash but it sure is easier.:-)I used to use the bounce card when shooting weddings (not for all shots) because it was quick, easy and gave a nice effect to some of the shots.
Thanks for the product information, the more choices the better, I think.:?