Former owner of a "Human KY-22S".
Tested mainly on toast.
The differences are that although it is 700W (instead of the previous 750W), it cooks much faster and much stronger to the point where it burns the bread.
The negative is that you have to play the role of the thermostat. As soon as the bread starts to turn color, you have to take it out of the socket because otherwise it will burn.
The positive on the other hand is that it reaches cooking temperature very quickly so you don't have to wait.