hi OP
it worked for us, but the first night wasn't easy. I just posted on another thread about my ds , I did not have a decent night's sleep in 8 months and neither did he. It was affecting the whole family.
Me and DP decided we would support each other. The first night I was crying along with the baby! Ds cried on and off for 45 mins in total. But when I say cry, it wasn't heart rendering sobs (like mine!), no tears , just shouting angrily lol where he was used to me running in after 3 seconds ! (looking back I guess that's where I went wrong ...? )
That night he went right through to 3am - never done that before
the second night 15 mins shouting, slept through
third night 5 mins shouting , slept through
That was 2 months ago
now we have a baby that sleeps 7pm - 6am and his day time naps are a lot better too.
we have had the odd couple of nights where he has regressed but this has been down to him having a cold .
every baby is different and as Fairy pointed out it doesn't work for all. It worked for us - so far - but you know it can all change ! arrghhhh