I haven't watched any videos - I am avoiding spoilers until I hear the album - but a reviewer of the show last week made it sound like it was the best thing he'd seen from them since their Ty days...
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 .