Product review (5 stars): You might not know you need these, but you do.
These still smell great after a week of daily use, and remove even the most stuck on crud with ease and leave no scratches on any dish or surface I've used them on.  I even bought some for my parents.  You might not be the type to worry about rather or not your old sponges are cleaning or spreading disease and filth like I do, but once you experience the difference of a clean looking and smelling sponge with each use the old ones seem as bad as using your hand as toilet paper.  Expect old fashion sponges to vanish quickly as they seem obscene next to these.