Product review (4 stars): Look great, clean up easily
First off, these black gap covers look very nice between our dark granite counter and our black-topped range. Can't really tell after a week how long they will last, but they seem unaffected by heat from the nearby burners. They clean best with soapy water on a sponge; using  a dry material to clean them doesn't work well (too much friction with the silicone that the gap cover is made out of).