I personally feels Norton's product is ok. Actually I'm using the Internet Security, not the Firewall stand alone. Actually they are the same also la. But if you look close into the confiuration option, its actually very CHEAM. Must really know how to configure, else either all get entry or all kenna denied.
Hear of Sygate also, will try the near future, as I've not formated my PC since last year after installing Internet Security. Other times, the systems seem to have lots of "bugs" and "worms".
Need to get the Pro version of Zone Alarm, else can forget about it.