With our first I waited the recommended 4 weeks until bfing was well under way. We only used it when she got really fussy like in a store or what not, usually when she was hungry but mom was exactly able to feed right that second. She never really got attached to it so I don't really know how long she used it or when we took it away. With our second, well he ended up being a thumb sucker so I tried to get him hooked on a paci instead for the reasons posted before (easier to take away then a thumb) that worked for a few months then he figured out he could pluck it out with his thumb and insert his thumb. So that pretty much ended the paci, he eventually would not even take it. He really only sucks his thumb when he is tired or has just woke up. I hope he doesn't do it forever... I took with shamefully admit that I sucked mine until I was like 7. I really hope he doesn't do it that long.
So we will have some available for this baby but will only use them if baby seems too fussy or tries to use me for one. Oh forgot to add that my first used me as a paci and had I known better would have probably pushed the paci more. We will still probably wait a couple weeks to make sure bfing is going well before we introduce it though.

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Nikki ('78)
DH Chris ('73)
DD Madison 7/11/03
DS Colton 7/18/06
DS Fisher 5/31/08