Pros:

Makes the survivors much more indimidating.
Works in mulitplayer.
Has first person view.
Very nicely made.

Cons:

Sometimes arms clip through belt (notably Rochelle), but I could care less.

Rochelle is a man. (An improvement no doubt.)

Conclusion:

Amazing skin mod. Works fine with no bugs, and makes everything look cooler :D
Maybe release one for the L4D1 survivors? I've almost stopped playing previous campaigns because they don't get the skin XD