We have had the cooktop for about a month now and the heating/cooking performance has been very good especially the middle 20k BTU center burner. Works wonders when stir frying. The only issue we have are that each of the 3 grates come in contact with the stainless steel cooktop and has started to scratch it. The rubber pads provided on the cooktop still leaves areas in which the grates make contact with the cooktop.