Product review (5 stars): Great solution for the gap!
We discovered after having a new range installed that there was a difference in height between the cabinets on either side of the range.  These gap seals are the perfect solution.  They stay where they are put, they mitigate the obvious difference in height of the cabinets and they eliminate the possibility anything will fall down in the gap.  The fact they look good, are dishwasher safe and are fairly heat resistant are just bonuses.