Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent product

I bought these for two reasons. My original Apple ear buds are not very comfortable and have little noise cancelling ability. My son-in-law is a professional concert musician. He recommended the Etymotic Research line of products. I purchased this as a mid-level product. I fly many times every year. I love the noise cancelling aspect. Perhaps slightly more might be possible but I have noticed how much more relaxing it is to when using these to block out the roar of the airplane. I sometimes have them in my ears when I am sleeping. The sound is a huge step up from the Apple ear buds. Overall I am very satisfied.