Pros:

-Good old school L4D 1 style (the one and unique)

Cons:

-Too long chapters (can be splitted in two)
-Lack of medkits
-Lack of weapons and ammo
-hordes, specials, hordes, specials ...

-Way too hard due to these four points.

Conclusion:

The left 4 dead 1 feeling i search (so rare these times) but ruined by lack of a lot of things.
Split levels, add more items, reduce a little hordes and specials and it'll be perfect...
I gave up playing at map 4, stuck with 2 wooden crates...