The app has many different types of waves, varying in intensity and location (beach, rocks, etc.). Many of them sound similar enough that if youre not a real sound connoisseur, youd probably be satisfied with the lite version. But if your moods are sufficiently nuanced that you want just the right waves at just the right moment, then this app is for you. My only complaint, which is true for all the Sleepmaker apps, is that the selection wheel disappears as soon as you make your choice, not giving you enough time to examine other options. You have to touch it to get it back. So if youre "surfing" through the sounds looking for one you like at the moment, then you need constantly to touch the screen over and over. Otherwise, I like this app and all their others, too.