Norton's has definetly come a long way as far as being a "system hog". 360 is not only optimized better for slower computers, but it has also become much more user friendly. The problem i see with it, is that it is overkill. The full suite is full of features that a normal person will never need. Sure internet security is important, but there is no need to overdue it. Free alternatives such as Avast, and AVG are much more resonable choices for your everyday user. More importantly they are free.
I'am sure there are a few people on this forum who would benefit from some of the features that 360 offers, but for the most part it is a waste of money if all you are doing is surfing the web and doing a little online gaming.
My advice, Avast, and stay off porn sites. Also Facebook advertisements, and so called "game hack" website are nothing but malicious. For the tool who said they haven't used any anti-virus in 5 years, it is just a matter of time before you regret that decision.