I don't think we will use ours much in the begining as our house is designed so that eveythigs is central,plus he will be sleeping in our room at night.
When we move him into his own room I might use it as the boys sleep next door and teenagers waking grumpily in the middle of the night is not a pleasant thing! This I guess will all depend on how he is sleeping then too. If he's still waking in the night then we'll have to use it, but if we are fortunate enough (fingers crossed everyone) to have him sleep through the night then it probably won't need to be used much.
the rooms not far from ours (just the other side of the bedroom) but to stop bubs from waking the big boys it might need to be used.