Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not what I was expecting!

I ordered this headphone after reading a lot of reviews here in Amazon and I was encouraged to buy it. Here is the truth: the product blocks about 75% of the ambient sound but you can hear all other sound clearly!A friend of mine advised me to get a Bose product that he owns but I did not listen to him. I'm really disappointed!