I cold steeped some hazelnut flavored coffee in a press and added it to a brown ale during bottling earlier this year. I really did not care for the flavor it imparted in the beer. Which is to say, everyone thought the beer that had no flavoring tasted better than the beer with the coffee. Will I make a beer with coffee again? Perhaps, but make sure you use some great coffee. I would go with something that is full bodied, mega smooth, and very aromatic (i.e., Ethiopian Yergecheffe) if I did it again.