Instruct: Classify Amazon reviews into positive or negative sentiment
Query: NO GOOD as a birth control method!

My wife wanted to use this method because she was tired of the side effects of other birth control methods. We were amazed at how the cyclebeads website claims that it is 95% effective. Well, we should have known it was too good to be true. Three months after using this product, being VERY mindful to use it correctly, she became pregnant. DO NOT USE THIS PRODUCT IF YOU'RE TRYING NOT TO GET PREGNANT! It's a waste (although I'm very thankful for the son we have now!).