The problem i had with Zone Alarm turned out to be the same problem i had with Sygate (that and the minimizing problems). It lagged me in online games. I know it sounds like something that would be all in my head, but i know it to be true. That's why i ended up uninstalling Zone Alarm, after a long while of lagging in games, which i thought for that time to be problems with my ISP.
I don't know why firewall programs would do that. Something to do with my router maybe...i dunno. I don't think it was just in games, but probably was happening all of the time, just more noticeable when gaming. It wasn't a constant lag, the games would just stall a couple times a minute, sometimes more, as if i were going to get disconnected, but then the game would continue. During the times when it wasn't stalling, it was normal. So it seems those firewalls somehow 'pause' my internet connection at times.
Like i said i used Kerio 2.15 for a while, and that problem didn't happen when i used Kerio. Though Kerio bothered me in other ways.
Hope i explained all that well enough. So i'm still in need of a firewall, i'll probably end up trying a more obscure program, as the popular software firewalls haven't served me well thus far. Any recommendations would still be appreciated though.