Pros:

-Lets you kick anybody from the lobby as long as your lobby leader.
-Makes the menu look a lot better.
-Adds new mutations to the game.
-You can change your add-ons while in the game.

Cons:

-Only people with the mod can play the custom mutations with you. (-.1)

Conclusion:

It makes the game a whole lot better and adds WAY more features than the regular Left 4 Dead 2.

Pros:

*Good for trolling people
*Can be funny if you time it just right at a certain situation.

Cons:

*Gets annoying after a while

Conclusion:

I think it's good... I like it but I don't use it as much as I used to

Pros:

*Perfect song for a perfect game.
*goes great with the fact that there's a zombie apocalypse and they just avoided death.

Cons:

*The song doesn't start at the very beginning but it's no big deal.

Conclusion:

*I would recommend this to all players in l4d2.