Comodo Firewall is alright, considering it is free. Most of the advanced options are for tech heads who know what they're doing with regards to personal online protection. There latest release however, version 18.104.22.16808 is a total mess. Custom rules aren't remembered from within the program and as such, a security leak has been developed with regards to out going programs. One other thing and I have written to them about this. Has anyone noticed that when running Comodo on either Windows 7 or 8.1, you notice a huge slowdown when running batch files. I made and use a batch file to clear the event logs of both Platforms when I need to. Without Comodo installed, the batch file takes all of ten seconds to run. Install Comodo and watch that slow to almost two minutes, expecially with Windows 8.1. Comodo tried to put the blame back on me, stating the speed a batch file runs depends on how potent your CPU is. Well, I'm running a AMD FX 9590 and there's nothing slow about that little job. When I informed them of this, they must have thought I was telling a bit of bullshit and demanded I send copies of my system info, Comodo logs, etc to prove I was telling the truth. They at least had the balls to apologize for the problem and said it would be fixed by their software engineers with later releases. Joke of the year I think. The Firewall is free, so I really can't see them paying their people to fix a little problem like that. Other than that though the program is not too bad. At least the option for developing custom rule sets is there and they work , along with the option to export your rules as a XML file. Just be careful of what version you use.