What expression would be the opposite of "Deal Breaker"?


I understand that "Deal breaker" is an expression used for a feature/characteristic that would make one not go for a deal (or terminate a contract), even if the deal's other features are great.


What expression would be the opposite of "Deal Breaker"? I'm looking for an existing expression that would describe a feature that would make one go for the deal, even if there are other not so great characteristics.


The expression could fill the sentence below:



I know this phone carrier has higher rates and everything, but if they are offering free iPhone to us if we switch, that would be a ! We would totally go for it.




Answer



That would be the clincher - a fact, argument, or event that settles a matter conclusively.


In OP's case, the matter in question being which deal to sign up for.


EDIT: Since there's been some discussion about "levels of formality" in comments, I'll just say that clincher is far less informal than "we would totally go for it!" in OP's example context, and that a "clinching argument" wouldn't be out of place in the most formal debating society context.


There's also killer feature which "kills off" the competition (cf killer app), but I think this is more popular with ad-men and reviewers than with Joe Public trying to choose between rival products.


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