Symantec products get favorable reviews for reasons that are difficult to
fathom.
They tend to be resource hogs, although supposedly the newest version is
better.
They are incredibly expensive for what you are getting.
Worse, NAV can be impossible, I mean impossible to remove without taking
down your entire hard drive. Having experienced this I will never use NAV
ever.
For general antivirus use free programs like Avast and AVG are more than
adequate.
It is a myth that most general users who are behind a hardware firewall in
their router need a software firewall. For most users software firewalls
just complicate even further setting up networks.