Advantages: Easy to use. One can simply type in the URL of the block site and hit enter. The Ports they have are already checked and verified to be valid.
If pages do not display properly, go back and make sure that the "Remove Scripts" field is un-checked. It sometimes helps.
Disadvantages: User must check for themselves that the ports still work. In addition, web browsers must be configured properly.
Also for Socks 4 and Socks 5, one needs to install a program like SocksCap 2.40 (freeware) first.
**I personally prefer configuring internet browers and using socks 4/5.