I love this app and it really is effective for me. I am not a super auditory person who needs to have music on all the time. Sounds can annoy me. However, I have used this many times to fall asleep/wake up from naps or at night, to reduce anxiety or stress as well as anger, to get my procrastinating brain to want to get tedious stuff done, even to want to get up and work out. I have students who have test anxiety who ask to borrow my phone to use the "magic sounds." It might not work for you but I have used it for 16 months and so far, it works great for me. Its been very helpful in a year where I have had a lot of stress from outside forces.
Mit Speck about BrainWave: 37 Binaural Series™, v7.4