Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Several fatal design flaws

The pump that comes with this ball is a joke. It's not one of those hand pumps, but rather a very cheap attempt to make a foot pump. It took forever to inflate the ball using the pump. After putting the plug in the ball I realized it still needed more air, but now the plug will not come out. I've had other excercise balls that managed to hold air without making it impossible to remove the plug. This is a poorly designed product.