Instruct: Classify Amazon reviews into positive or negative sentiment
Query: I really like these at first.

I agree with "Fargo Chowder" (review from 2007). These were really nice at first, but they trap sweaty foot odor, and about half the nubs have fallen off. Additionally, I get little red spots on the bottom of my feet when I were these (and not with any of my other sandals), which I can only describe as little pinching of the skin.