Product review (4 stars): Love this cooktop!
I was shocked to see the negative reviews. I can only think it was older models. If the cast iron plate that sits over the burner isn't postitioned correctly the flame flutters so maybe this is one of their problems? The only critique I have is that it can be hard to clean due to the star shape at the base of the star burner. A Mr. Clean magic eraser works well for the general amber haze & a ScotchBrite for the heavier stuff. Unless you are a martial artist and train nukite by driving your fingers into a bucket of sand, the scotchbrite can be hard of the fingers, so use the handle of a wooden spoon to scrub in the corners. Everything else about the cooktop I love and ratings elsewhere show it to be the top performer. Consumer Reports rates this #1.  The simmer function is great. I don"t have any problem with it taking too long to heat up. Seems pretty fast to me. I had an old gas stove before & this is faster. As far as the racks being too high mentioned by another person, I do find some heat coming out from under the burners and burned a favorite oven mitt that was placed too close to the burner but I now know not to set my oven mitt as close as I used to with my old stove. I would say check out other reviews as well & don't hesitate to buy this unit. I love mine and I am a very picky and critical about what I own and am an avid cook.