Pros:

First Person View
Third Person
Goes great in Dark Maps

Cons:

Name Doesnt Change, i thinks its better if it changes

Conclusion:

The Man of the forest has joined your survivor group, Killing zombies and finding a way out to safety, Rochelle ,Coach , and Ellis Lost Nick in the Shadows of the Swamp and Slenderman Joins. cant be a better time to leave your forest

Pros:

Really works
can be played with any mode
correct sounds
great for versus 
if playing a single player Mutation, this helps out a lot

Cons:

you can still hear the original special infected while playing the game, mostly with the witch

Conclusion:

this came out to support the Minecraft Left4Dead Special infected and it works, you wont regret it and you can try it out yourself if you don't believe me.