Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Cannon EF 24-105mm f/4 IS USM

We had bought a sigma 70-200 f/2.8 and was not happy with it at all, so we bought this lense because the reviews were very positive, and we are very happy with the lense. It takes excellent pictures and the IS really helps. The quality of the optics is excellent. We had such a good experience with the lense my brother bought the same one and is equally happy with his purchase.