I used the mattress topper the first night I received it. It had an odor but it wasn't bothersome. I did need to purchase deep pocket sheets in order to fit it over my mattress and the topper. My first impression was that it was too soft and wondered if I was going to like it. After getting used to it the first night, I am very pleased with it. It is very comfortable and I don't wake up with hip pain like I was before. My husband also has had no back pain upon waking up since we got the topper.