Hello,
I used AVG Free antivirus before and I really liked the feature to automatically direct connect to the internet if the proxy server does not respond. This is useful for me because at my university I have to use the proxy (with Usename/Password) but at home I have a direct internet connection. So with CIS I have to add the proxy-settings including user/pass everytime I enable it at the university and I have to disable it again at home. This is annoying and needs time.