Pros:

-Great movement
-You can blow off there heads lol
-Funny sound package 

Cons:

-Doesn't work on original campaigns'
-Doesn't work on a few add-on campaigns
-Gets annoying  after awhile

Conclusion:

Over all I think this a good mod with great potential. Just a few fixes would be nice but its still fun to play around with. And FYI it does work for add-on campaigns for the l4d2 setup.