Instruct: Classify a review into positive or negative sentiment.
Query: Not bad, not perfect

I am searching for an air purifier to take care of dust and germs. I had a sharper image pro gp and tried this one to replace it. The features are great and it does circulate the air well, the only downside for me personally is that at the lowest setting, you can still hear the fan. Some people don't mind or like the noise but I personally like machines you cannot hear. That's my only downside.