Product review (2 stars): Not so much.
I've had the metal ones and they do not conform well for a stove that doesn't sit flush with the counter. Had a composite counter installed and the stove is higher even with the feet adjusted all the way up.  I tried these, and they span the uneven gap (1/4"), but don't stay secured.  Crumbs stick to this where they would wipe right off of a metal one.  These do not stay in place while wiping either.