Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not so great

I have been running for a few years and loved my asics 2110's. So, I was really excited when the 2120 came out. However, they don't fit as well as the 2110 and my knees have started to hurt with them. I never had a knee problem with the 2110. I am thinking of switching to the kayano line to see if those are better shoes for me.