Positives: Superb sound with an amazing 8 Hz - 25 000 Hz range of hearing. Long battery life - I use the headphones approximately 2 hours every day, but charge them only twice per month.
Negatives: I hear a quiet but annoying buzz in the headphones when they are bluetooth connected (I guess this is a common problem for all the bluetooth headphones). All the buttons become inactive when wired connection is established.