The Aux 3 features to me have been very hit or miss. Some have great ones like the "Hail to the Chief" song on the George Bush engine or the fast paced Bell on Strasburg 31, but honestly most of them have been very lackluster. I have a bunch of engines where the aux 3 function is literally a hiss.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .