I love listening to water sounds - for sleep and relaxation - though I found that I just can't sleep to the sound of *crashing* waves. I'm also not that into music overlays if they are not done right they can have the opposite effect for me. I prefer white-noise to sleep - something constant and non-surprising.
However this one's very pleasant. The hydrophone stereo 3D recording is quite brilliant, it's difficult to explain but listening to them with noise-cancelling ear phones (especially track 7) I have physical reaction to the sounds.
The track(s) with music overlays were spot-on; constant and no 'gaps', flows very nicely.
Very well done, highly recommended.