To be perfectly honest, I mainly use either open-source software or ahh, you know, software obtained by other means. But after a week of using this trial, I had no qualms about buying this. Simply, it is the most entertaining and mesmerizing screensaver I've ever seen. It's customizable not only for personal preferences aesthetically but also for tweaking it's use of system resources. If my laptop is nearby when my wife and I start watching a movie, I have to make sure I close the lid since many times it's more interesting to watch than what's on the tv screen. Great, cool, well-done etc. Frequent updates with no problems transferring the license over on each install.