Product review (4 stars): Nice cooktop
I had this cooktop for 7 years at a home I just sold. It is a beautiful cooktop and it is a very solid unit. We never had any problems with it.

Yes, like other reviewers have mentioned it does need to be cleaned on a regular basis. You can't get grease on the cooktop and continue to splatter more and more grease on it without wiping it off or it will build up. But if this does happen like it did on mine it can easily be restored to look new again. Just remove the grates and all other metal parts, put them in a large trash bag outside and add a 1/2 cup of ammonia, seal the bag tight  and let it sit out overnight. The fumes given off by the ammonia will melt away all of the grease. Then in the morning just rinse off the parts in hot water and it will look new again. I used many types of cleaners on this cooktop and this method by far was the easiest with the best results. I used either a magic sponge on the glass cooktop part or cooktop cleaner or baking soda mixed into a paste and wiped with paper towels.

We are looking for a cooktop for a home we are now building and most cooktops look very cheap compared to this one and are more expensive.