While other similar screensavers (such as RedPill) are free, this one offers several more customization options, which make it a real stand-out, IMHO. The only one which comes close to this is MatrixGL - which, unfortunately, doesn't work on Intel systems.

If you want a bit slicker display than RedPill offers, along with a boatload of additional customization options, give this screensaver a try. I think it's worth the small shareware fee, for the Intel-native release, if nothing else. Also, check out the developer's site for several other unique screensavers.

** Note that VersionTracker has the version identifier wrong: The current release (linked to here) is actually version 1.0.5, which is, indeed, Intel-native.