Ill probably upgrade to the non-lite version. Its beautifully rendered, highly detailed. My only complaint is that it only shows a couple of dolphins at a time. Thats probably a good thing, though, as it keeps me working on what Im supposed to be working on. You have some options to play with: detail of the sea floor, for instance.
Do know that this, and all others by this company, isnt so much a screen saver as it is a dynamic desktop background. It does also have a screen saver option, but it works independently of Mac OS X.