Yes, the paid version is better and it doesn't cost that much. They have a special at the moment. Its exactly what you need, 3 computer licence and for a period of 2 years. I also had the free version but it does not really protect you. The full version has the features - anti virus, spyware, spam, firewall, rootkit, mail scanner, link scanner, web shield, resident shield, ... Set up is very easy and managable. Just with some time of checking out what each feature does for you, you can set it up and leave it. Sometimes it is a bit annoying with its warnings but that too can be controlled.
I am very satisfied with the product. It only lags the system when it comes to a full system scan, but this is scheduled for once a week when I'm not busy with important work, like Saturday afternoon.
Verrrrrry Goooood.