I've been using Kerio for a long time and I loved it, but when I updated it (now it is owned by Sunbelt), when you open the gui it starts running slow as hell or it freezes up. Apparently Sunbelt turned it into a piece of shit, and I can't find anywhere to get the old version. It also bugs you about buying the advanced version. I tried Comodo but I haven't been able to configure it well enough. I can't get DC to work properly with it. It's also giving me some kind of bullshit about Winamp trying to use other apps to access the internet, like firefox or azureus, so then if I block it then firefox or azureus can't access anything anymore. I think it's wrong to begin with. I don't like it that much anyway. Zone Alarm... let's just say I'd rather use Windows Firewall than that thing.
I just don't want to dick around with ports and shit, but still have things work while blocking everything else out.