Originally posted by: Gigan
I have used Zone Alarm, Sygate, and Kerio for Windows XP. Here's just my experience with them.
Zone Alarm 5 - gave problems with playing games, seemed to blog down the system (uninstalled)
Sygate - problems with WinXP SP2 and Cisco VPN (uninstalled)
Kerio - Lots of firewall messages, not as easy to work with settings as Sygate (current)
I cannot recommend Zone Alarm 5 from my experiences. Sygate is a great firewall, but it just didn't work with my VPN which was why I had to switch. Kerio is another good firewall as well. I don't have any problems with it, but it's not as friendly (in my opinion) as Sygate.
The best thing to do is go to
www.download.com and search each software and look at the user reviews. It's not 'totally' accurate, but gives you a general idea.