Initially I received a defective unit, but it was replaced with one that works. Before everything boiled, even on the lowest temperatures, but now the food simmers at 300 watts like it should. I was shocked to see how badly the pot that came with it got burnt... I have only boiled water in the new pot, and it has not warped, and the color has not changed, so I guess this is a good sign that the pot is not over heating.
I really like this product because it works as the manufacturer intended. It boils water and heats up extremely fast. I tested the time the same amount of water, same temperature and same sized pot came to a boil on the cook-top and on m gas stove, and trust me, I had prepared a cup of tea before the gas stove brought the same amount of water in the same size pot to boil.
I have found that the lower temperatures for simmering etc., work well on the watts temperature setting, and a slow boil works well on the degree Fahrenheit setting. Hope this helps.
I really like this cook-top.