who has successfully sleep trained with the cry it out method?

I'm just asking those who have tried it and if it worked or if it didn't & your experience. How long did it take? Did you notice anything different about your baby? (Like some people say it traumatize them) 
We have tried the crying then going in and soothing then without carrying but it makes it worse. He falls asleep on his own when is he in bed with us (has been sleeping with us for three months now, he's 11m).