They have a free trial that you can download. It just lets you put limits on incoming/outgoing data for the whole machine, certain programs, and/or each network connection that a program makes (you can limit certain IE downloads but not others, etc.). Last I checked, it had nothing to do with firewalling or managing multiple computers. It is only for standalone machines.
For networks I'd use Linux and the iproute2 tools though the *BSDs can do the equivalent I believe.
Gaidin