We purchased this cooktop to replace an older model GE gas cooktop that was about 20 years old.  This one has the flexible middle burner that can allows for both an additional smaller burner or a larger one.  It also has a gas lock on it, in case you have kids around are cleaning around the knobs and don't want the gas to turn on accidentally.  The very best feature, I think, is that this cooktop fit perfectly into our granite cutout as it is similarly sized as our old GE cooktop.  It was a perfect fit.