I have to say, I tried this as something that has always piqued my interest - using sounds and music to make me a more efficient human. I was skeptical, I put it to the test while coding.

Within 10 minutes I felt a strange calm hum in my head and have now been using it for 2 hours with no sign of dropoff. Very cool, going to keep using. If this continues like it did tonight, I could see this becoming part of my daily work routine.