Pros:

* Brilliant new chineses setting
* new enemies with great ammounts of creativity and imagination used
* Chinese witches!!!
* New or previously unused weapons
* panicevents which are intense but fair
* quite challenging even for skilled players.

Cons:

* finale is suicide (with bots, strangers, or untrustworthy people)
* few buttons took a while to launch had to keep pressing them but they worked eventually
* Finale Tractor took me 3 goes to figure out how to push it properly

Conclusion:

This is definatley worth a download it's creative, intense and comes up with many new ways to keep you moving or grind you to a halt.

It has a great Chinese cultural feel to it as well as a spectacular opening.

I would imagine this being difficult for new players or people with low end computers which gets high ammounts of lag however non the less I suggest giving it a try.

Pros:

+Great use of Lighting and Panic events.
+The Hacking moment was great.
+hazards I haven't seen in the original left 4 dead game or in any other custom campaign.
+Intense finale and brilliant rescue vehicle.

Cons:

-You only have a pistol until about half way through the first map.
-some hazards aren't sign posted such as the electrified water which I stepped in because I wasn't expecting it.
-Finale got confusing when it got to the train just being suspended with no sign of it doing anything I didn't know if I needed to activate something else.
-Don't know if this was a problem for anyone else but the bots wouldn't get in the train at the end.

Conclusion:

Other than the fact you have to procure everything and bots don't respond to something this campaign was great the lighting was especially great and the panic events felt intense I think this is better than crash course by far!

Pros:

Great reconstruction of half life 2 very accurate and is brilliant for left 4 dead.
Although all the campaign maps are short it takes a while to do.
Finale is intense.
Textures when imported look great and has items from half life 2 (not for use obviously.)

Cons:

Installation took a while but I personally didn't find it difficult and felt it was worth it.
Finale wasn't very clear although it didn't take long to figure out it isn't the easily found.
Slippery floor is a bit to slippery more so than I remember in half life 2 you can stand on it and go flying.
Witches are hard to get past since they seem to block the path.

Conclusion:

This campaign is great even though there are a number of Cons in it that can never be helped I enjoyed playing through this and will want to revisit it sometime soon this is perfect for fans of Half Life 2!