I have an old friend who used controlled crying on her (now 8 year old daughter). She is the loveliest girl, was a delightful baby and now STILL goes to sleep at 7pm every night - she loves her bed.
Our friends swear that it worked for her, but they refused to do it on their son (who is now 18 months) and used gentler methods with him.

I guess it's about doing what YOU feel comfortable with AT THAT TIME. Not that I am advocating CC because I would never do this with my baby, but it works for some.

Sue x