I have used both firewall. First sygate and now Zonealarm. I must say that i have encounterd the error showing it as not repsonding. Also i had the feeling that it slowed my startup down. I never had any problems installing it. I don't find Zonealarm to be more userfriendly, with sygate you can see what program are running and where those come from. With Zone thats not alway's clear, and besides it only has room for 4 icons. What i do find usefull is the stop that Zone has. BUt i don't know if that works. IF you ask me, sygate has the upperhand. But thats just personal opinion.