Instruct: Classify the given Amazon review as either positive or negative.
Query: Best in-ear headphones for bass

These in-ear headphones are excellent. I like to be able to feel the "punch" in the music, and these really deliver. The bass is strong, but tight, and does not distort the sound. They fit very well and I can get a good seal. I only have one quibble; I first bought these in 2005 and after almost a couple of years, one of the wires became defective and so I could only receive sound in one of the earphones. After I notified Ultimate Ears and sent them back, they sent me a new set free of charge. As such, I am very happy with the customer service.