I don't think you need SOS to have good sleepers.
There are babies who just sleep well. There are some who don't. I have been pretty blessed with good sleepers I guess. My eldest slept through at 4 months before even starting solids and she had a dummy. My son was in our bed for 3 months and he did used to wake once for a feed until 18 months but it was always before I had gone to bed so it wasn't too big a deal. My third slept through at less than a week old (ok it was for 8 hours 11pm-7am) but pretty amazing considering her age and she has been a brilliant sleeper since birth apart from a few hiccups during 4 month wonder week. I had a 4 year old, 2 year old and newborn. I would challenge anyone to have 3 kids that age and follow SOS All my babies have had dummies. They have been fed to sleep (apart from eldest who was ff) My girls slept through before starting solids.
What made sense to me (and I didn't need to read this in a book) was to start a night time routine from birth. Feed, bath, feed, swaddle, cuddle etc. but no set bedtime for such a young age. I found my babies found their own routine. Now I have a 6, 4, 2 year old and they know the exact routine every night. They even know when to turn TV off to go upstairs and have a bath and get ready for bed. I go up and run their baths while they are watching TV, they turn TV off and run upstairs.
I have a friend who is a nanny and swore by tiz whilst minding other people's children and refuses to follow the routine for her own baby.