It's crap, and I'll tell you why.
Norton heuristics are not near as good as Panda's, for instance. Panda will simply smoke Norton on any level, particularly the enterprise level. They have far superior product offerings in every aspect.
I can't count the number of instances of Norton I have seen where the system was still infected by virii that were picked up by Panda's ActiveScan and removed. So, not only does Norton hog resources and bring a system to it's knees, it doesn't even do a proper job. That is the pinnacle of uselessness.
On a 512MB or higher XP machine, Panda Platinum will simply trounce Norton. Norton doesn't stand a chance against it. I don't care what reviews say. I've serviced the machines.. I've seen the effects, and Norton is about as effective as a fart in the wind.
On the enterprise level NOD 32 will spank Norton as well. Norton has an informative website. That's about it.
On a home machine that is light on resources I can only recommend Avast! It has a small footprint, takes up very little resources, eliminates threats that Norton doesn't and it doesn't cost a thing unless you want the pro version. You get free live updates for life (unlike Norton) as long as you register every 19 months or so.
There simply is no reason to use Norton. It has no advantages, especially to the home user.
For the corporate admin, I recommend Panda Businessecure for small to medium sized businesses (that's the one I have), or Enterprissecure for large corporations. You'll never look back.
despite its bad reputation among "tech" people norton is not a bad product at all, especially on the enterprise level. It can cause some performance hits though on your machine just like any other spyware/malware/anti-virus.
Personally I would rather load these types of applications and have them run in the router, not in the machine but that is not possible in everyone's configuration.
What Norton does have is the best support out of anything else. Their website, online, and updates (general support) is some of the best. That is why it is also so expensive, their support costs money to run.
So, really it will be up to you to decide. Try out other things mentioned here and then make a choice to keep it or try something else.