Pros:

-Ridiculously amazing lighting.
-Fantastic prop placement.
-Large environment.
-Fits into the L4D universe perfectly.
-Challenging.
-So much fun.
-Awesome Easter egg :D

Cons:

-Cannot think of a single one.

Conclusion:

All in all, this map is bloody fantastic. It was the best survival map I found on this site in a while. The lighting and little details are something to be proud of. The only reason I didn't give it a 10 is because I'm reserving that for the map that is so good it breaks my brain.