I have only just started using this app, and while it seems quite effective at helping me relax, i wouldn’t want to comment in any depth about it in that respect at this point.
The reason I feel compelled to write a review, is to say to the developer/Darren that the sound quality should be much better, as should the visuals. The sound is acceptable when using the speaker, but not with earphones. I would have thought for an audio-centric app, the quality would be a top priority, but for me is a real letdown, and there is really no excuse for it – if you have access to the resources and technology needed to build an iOS app, you have access to the resources and technology needed for high-quality audio.
So a good app, but could certainly be improved upon.