Instruct: Classify Amazon reviews into positive or negative sentiment
Query: What a piece of junk!

This bed replaced a Coleman brand bed that cost LESS than half of the Aero Bed. Big mistake, I charged the pump the inconvenient 24 hours and it held the charge for <1 minute. The poorly designed valve leaked right away. The membrane inside worked for an short period, then it lost elasticity-then it leaks. There is NO provision to pump this bed up manually, i.e. with a bicycle pump. The description reads "self-inflating" this means you inflate it yourself! If the pump fails-you have a worthless bed. Its going back tommorrow!