Okay, so I know a that basically when you move from free to pro, all you gain is the sandbox. Then from there, you gain the firewall and anti-spam.
I'd like to think I'm an advanced user, so I have a fair deal of common sense regarding safety, so I am not really sure why I would want the Avast firewall over Windows firewall, and on top of that, Gmail has built in anti-spam, so I really don't need that. Honestly, it doesn't seem like one would really need Avast Pro, or Internet security, unless they were lacking anti-spam and common sense. So let me know what you think. Because I think we can all agree that computer safety is key. Thanks guys!