Pros:

+ Textures looks excellent and fits through the map.
+ Portal Easter Egg!
+ Well built.
+ Enough zombies to kill.
+ The tank is a bit customized, which is great.

Cons:

- None.

Conclusion:

This map is yet huge, but you can never get lost in this map, good story to it, customized tank(s), the textures are excellent, and map should be recommended to all L4D2 fans.