Mums who have tried the "cry it out-CIO" method...I need Ur input and advice pls!?

I went through the same issue at about 10 months. There were nights when I would let my daughter CIO for hours...I thought it would never end! Eventually after a couple of long and tiring weeks, it started to settle into a routine. She's now almost four and has no problem going to sleep on her own, or sleeping on her own through the night.