Me neither. I wonder if people who have treble issues aren't having a seal issue or some other thing influencing the sound? Having said that, I did hear treble issues in my first set of ie800s bought and returned a year and half ago.When it comes to burn in, I don't people know how to do it. I've seen people say they just play music at a moderate level. Burn in needs to be at a very high volume for a relatively short time.