Great app, Love it:

Works great. I use it in many ways .
It does what it says it will do. Its great for going to sleep. If you need a 15 minute nap when really tired you wake up with the gentle alarm feeling great.
Great in mornings and studying with. Can customize it to what sounds that are right for you at a given time.

William Weldon about BrainWave: Sharp Mind ™, v5.1