that appears to be for making a desktop image, not a screensaver. not sure how that would work. not to mention $100 is a bit much for a screensaver. one of the ones i pointed out is free, the other $20.
monk - no problem, i looked into this earlir this year. the problem ended up being that only the paid one would cycle (after paying) and i didn't really want to invest money in the project. the one i made ran so often without properly repeating that it started to burn some lettering into the screen. my girlfriend actually thinks it's kinda cool that the words "Ohio State National Champions 2002 are barely visable against a blank screen though. but i'm glad i noticed it in time.
somehow $200-$300 doesn't seem like any better of a deal. however if their demo is fully functional, it might do the trick. i guess the question is whether the monk man is looking to make them for mass distribution or just to make his mac look pretty when he's not using it.