Pros:

Incredibly challenging, Custom music, Beautifully made, no crashes, an abundance of infected, incredibly awesome final. Did I mention the difficulty? Almost impossible if you go at it alone!

Cons:

Absolutely no cons!

Conclusion:

This is the best map I've ever played. It was beautifully made. And even though I died 6 over the course of the campaign, I had a lot of fun playing it. 
I can't recommend this Custom Campaign enough! You Have to Play it for yourself.