The first "Perfectflow" stove I bought would not maintain the gas flow rate. It was either on full or off. So much for "Perfectflow". I sent it back for a replacement. On the second stove, I could not even open the lid, despite pulling very hard. Coleman either can't make a quality stove or has zero quality control. I will never purchase another Coleman product again. What a big waste of time! That's too bad, since I have a Peak 1 stove from the early 1980's that still works just fine.