My boys, ages 3 and 5, love these.  They quality of construction is good and they have lasted well.  They have one near-fatal flaw, however -- the cool pictures are on the back.  As a result, the kids want to wear them backwards.  This leaves the adult in charge with the annoying choice of (1) letting the kids wear the underwear backwards and then running the risk of wedgies throughout the day, or (2) having a battle over putting them on the "right" way.