Product review (4 stars): We have loved every set of these we've ever burned up!
It's so easy to put these burner covers on the stove, then turn on the wrong eye (ya know-the one the pot ain't settin' on!).  So after two previous sets got blackened by carelessness, I bought this third set for my wife for Christmas (carelessness of each family member at some time or another, except the one too short to reach the knobs!).  The price has gone way up, so the value wasn't good at all, like the first two sets.  The over-priced status brings the rating down from five stars to four.  The product is great, but perhaps the law of supply and demand has kicked in, with a dwindling supply at Amazon.com.  Hope we can turn on the right burners, or teach everyone to take all four covers off the stove whenever they use even one eye!  Not sure how much longer I can get these at a more reasonable price!