Instruct: Classify a given Amazon customer review as either counterfactual or not counterfactual.
Query: The good - Excellent sound, particularly for the price and small size - A few in-ear sizes available to ensure a good fit - Once fitted, blocks out most ambient noise, which is great at the gym with other music blaring - Mic clarity is terrific when on calls  Opportunities to improve - Don't really care for the flat cord as it tends to become knotted versus the round cords with an iPhone for example.