Yes it is, but some settings IMHO are too harsh. You know me already modified the source code to it. It is a great mod by default still.
I have created a threat level system for this software. Say for example a users browser is infected by spyware, they are blocked and referred to sites with cleaning programs. The original software will permanently ban them after three attempts to access a site. Talk about a little harsh because I know allot of people that accidently install allot of these spyware programs.
Right now I have two threat levels
Blocked / Referred to information to correct the problem.
Blocked / PermaBan after 3 attempts (zbblock default)