Product review (5 stars): Works great!
I was so worried about maintaining the appearance of my smooth-top Whirlpool range. It came with a sample bottle of cleaner and a cleaning pad, which works amazingly well at removing water spots, burned food, etc. The protectant is an interesting product - it's almost like an "evaporating silicone grease/wax/polish" that leaves behind a slightly oily film. This may sound like a bad thing, but it helps keep the black surface black. It can streak a bit if applied unevenly, so follow the instructions carefully.