Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Quality Pump

I have used this pump for the past 4 months and I think it's great. I travel for my job so it's small enough to pack away in my briefcase. The best thing about this pump is the manufactor. The first pump I had wasn't sucking properly. I called the 800 number in the manual and told them it wasn't working properly. They sent me out a brand new pump at no cost to me and I received it in two days.