i'm finally getting my swap. should i change the clutch.

the guy weas telling me that i should change my clutch. b/c he said that he's had people come 3 months later comeing to him and telling him that their cluthc was slipping. should i change the clutch on that sucker? what exactly does he mean by "slipping" the guy told me that they will install the clutch for free if i get it at the time i get the swap. he said he has 4 and 6 puck and some other one's. well i am planning on doing a all motor on the b16. what should i do? get the new clutch? which brand would be the better one in clutche's? please help me out. thanks a lot!!!