Pros:

- a  near perfect port of l4d2 maps into l4d.

- sound/music were a bonus, added to the atmosphere.

- l4d 2 SI skins included.

- weapon/item placement was improved. supplies are more scarce now.

-bots worked well

Cons:

- boomer only has l4d 1 version

- SI skins still slightly buggy. once had an invisible smoker that when killed dropped a l4d 2 hunter corpse. another time, when an invisible hunter pounced me, the game crashed.

- pistol placement not consistent. first map had a pistol spawn that could be picked up by all members of the team, second map's pistol disappeared once picked up once.

- bus station tent shortcut not fixed yet.

- car alarm horde is slightly bugged. horde took about  half a minute to show up after alarm was triggered. 

Conclusion:

overall still a very good port, the cons are mostly small imperfections/ nitpicks. looking forward to the release of entire campaign.