Looks like the jury is really out on this one. All babies seem to react differently to it.

I have tried it with all 3 of mine, and it never worked at all........I would give them the boob at about 10pm, but they would still wake anyway.......

Charlie, BTW, slept through from 7pm to 7am from about 4 months old, then at 8/9 months (when he started crawling) started to wake again at night.......so I knew he COULD sleep through, but when he goes through little developmental stages, goes through a period of wakefulness again..........tis frustrating, I know, but it is just part and parcel with babies & toddlers I reckon?