Pros:

Great map design
Good challenges
Fun cresendo events
great map layout
Great detail over all of the campaign

Cons:

not finnished yet!

Conclusion:

this was my favorite campaign ive played on l4d! the only downside is its not done! it has fun ideas, great realistic feel to it, and varies greatly in environments! this is definatly worth the d/l time and i would greatly suggest it to all that see    this.