You may be thinking that banana flavoring doesn't belong in coffee and I have two responses for that statement...
#1: I used to agree with you. (The banana flavored coffee that I had sampled, to me, tasted like banana laffy taffy. While I do like banana laffy taffy...in coffee...just no.)
#2: Buttery, caramelized banana flavoring is a whole new level of yum!  Taste and see that it. is. good.