Thinking of trying the CIO method of getting baby to sleep. Any parents can share their experience?

My 6-month-old was waking every two hours at night. I was rally very tired so one day I just let her cry out. But the next night she slept for 10 hrs and woke very cheerful and rosy. It's been that way ever since, and she's even a better napper now. I know that it is hard to listen to your LO cry, but a sleep-deprived, miserable mom and baby is a terrible thing too.