Instruct: Classify the given Amazon review into its appropriate rating category
Query: Difficult to use, don't waste your money

These were a waste of money and also wasted my frosting. They are very difficult to use... every time I tried I was left with what looks like a squiggly mess with a hole in the center. Additionally, the plastic bags are junk... any pressure on them and they burst. I even tried them with mashed potatoes for Duchess Potatoes and they looked terrible. Granted, I'm not pastry person so perhaps a pro would have no problem but these were a huge frustration.