It is more efficient to buy cheap supermarket sponges and replace them more often, or do you find that more expensive options are worth the additional cost?
I used to use the green and yellow scotch-Brite but I've been sucked into the scrub daddy paradigm. They really are good scrub/sponges and last forever.
So many people seem to like scrub daddy but they're only available online where I live. They claim that these don't scratch but could I also clean for example the clear plastic water container from our coffee maker without scratching it?