I'm not too impressed. Unlike the fish, the butterflies' motion are very simple objects. In addition, there aren't any fine details such as bubbles or the rippling shadows across the bottom to enhance the realism. To pay for removing the advertising and access additional butterflies is too high for such a rudimentary animated screensaver.

Put the butterflies (and other flying/crawling things) in a field with waving grasses and flowers, under slowly moving/morphing clouds, and prairie sounds in the background... then I might consider it to be an innovative enough screensaver to purchase.