Pros:

-l4d1 survivors in l4d2? YAY      
-more protection
-works well
-passing smashing they shoulve went with the l4d2 survivors
-can put mod skins on them.

Cons:

-wont follow you,but i guess you cant do anything about it.
-there is no bill............. yet.
-this happend for me,but idk if it happens to anyone else, the game crashes on the first map of swamp fever when i enter the code.

Conclusion:

Great mod. it actually makes the game more intresting and more fun with it. I CANT wait for bill to arrive.