Product review (4 stars): Hot and Bothered
I'm not going to say anything different than what's already been said. The stove top heats incredibly fast and hot. It looks beautiful for about a week or two. The top scratches and stains very fast, and no amount of cleaning will stop it. Still, coming from an old Jenn Aire, this is an easy 4 stars

Update: as with many here, I too had a heck of a time keeping it from marking, until today. I found some great products by Weiman, that actually took off a years worth of stains. The Top looks new again, so its not a faulty product. Its us.
The two items I used are Glass cook top Hevy Duty cleaner & polish and their cook top scrubbing pads. Seriously, it looks new again, so my only problem I had was the downdraft vent.
I give this a solid 4 1/2 stars