To resume, you will be eligible for:

A new identity on Internet.
Anonimity, websites to which you will connect won’t know from where you’re really connecting from.
Access to some geographically restricted websites.
Ability to get through some firewalls and get an unrestricted Internet connection.
Ability to bypass some providers connection rate limiting
A totally secure access to Internet, your provider won’t be able to spy your communications since these will be crypted using military-grade encryption.