i prefer software that lets me configure as much as possible, software that makes life easy, in my experience is not as good.
if you don't understand how to use/configure a firewall then read up on it and learn, won't do you any harm. most people that go out and buy firewall's aren't even sure what they do, they've just heard off a "mate" that they need one.
being a "techy" i like to know how things work, that way you can make an educated decision on whether something is necessary.
the rule at the mo seems to be that you HAVE GOT TO HAVE AND WOULD BE MAD NOT TO HAVE antivirus, spyware and firewall software, although this maybe true, do you not find your self in a battle between performance and security???
personally i think that installing AV s/w is a must, spyware scanners can be run periodically and do not need to be running constantly and XP's inbuilt firewall is sufficent as long as it is run alongside a hardware firewall ie a router with firewall.
again personally, (i'm a very personal person!

) all the recent hype about viruses and worms is over the top, keep up to date with windows updates and thats half the job done!
don't line the pockets of Mr Symantec and Mr McAfee any more than you have to!
interested in opinions on this, the way i see it is that the built in firewall in XP SP2 offers equivelent if not higher protection against attacks than kerio and zonealarm, the original XP firewall was a joke, we all know that, but has microsoft got this one right??? i think so.
J