Pros:

~Detailed
~No Bugs
~Free Space (kinda a double edged sword though)
~All the texture work properly

Cons:

With the free space it's kinda easy to kill zombies but they tend to spawn behind you too so it evens out.

Camping spots, mainly the vents can be used for some serous camping and your practically unstoppable with infinite ammo but you won't always have infinite ammo so the camping spots don't work for long.

Conclusion:

In conclusion it's a well thought out map  it was well thought out and deserves a L4D2 port.

Pros:

It's a very fun map and worth the download,
it's not too long but long enough for you to be satisfied it's pretty creative in some places by making you do puzzles and small mazes, the mazes aren't too hard either. It has the right amount of challenge and new features you won't see in the Valve campaign's, it's also more fun to play with friends.

Cons:

Sometimes my l4d will crash but considering most everything in this map are new props and not re-used ones I kinda expected that.

Conclusion:

In conclusion you should defiantly download this map and play with some friends