Pros:

+Black Ops 2 infused with Left 4 Dead. If you one of those Call of Duty fans, recommend downloading this. The sounds are pretty good, must have required a quite a bit of time to obtain these sounds.

Cons:

-Not that I'm aware of any.

Conclusion:

I'm not a huge fan of Call of Duty nor Battlefield, but this kinda gives you a bit more realistic sence that your actually firing that specific weapon. Unlike the default sounds, there not as loud like the real weapons. That's where this mod comes in handy. Not a fan of the music though, but it doesn't bother because I listen to music while playing Left 4 Dead.