All of the 'useful' things mentioned, though, I have read in many other 'sleep guides'. Especially the importance of bedtime routines, catching tired signs and approximate routines for each age group. Teaching to self settle. That stuff is pretty standard info in regards to babies sleep. So why does SOS have such a following? The only point of difference seems to be the more extreme methods it suggests.
And VicPark, yes I have read it.