I've had the cooktop for a couple of months, and it's a not to cook on compared to my old electric stove. It boils water incredibly fast, heat adjustments are fast and accurate, admits easy to clean.
The main burner steadily lost power after the first week, and has been unusable for about a month. I've yet to contact customer service to file a warranty claim, but I will. 
Other than the failed burner, my only comment regards the controls. I don't like them much. It's hard to pick the temp, because there is no indication on the control to clue you as to where #8 is, for example. I also do not like being unable to actually adjust the temps. There are only preset choices. [This review was collected as part of a promotion.]