My wife and I did this. One tough night and three years later she still sleeps through the night reliably. We'll do it with our other baby once the doctor gives the ok. We also had a friend do it and she said it saved their household because their kids was waking up every twenty minutes. Sleep is so essential not just for the kid's development but also for the parents' functionality and temperament.
I don't understand folks who say it's harmful, unless they have some evidence to back it up. Because we definitely have evidence that inadequate sleep is pretty harmful.
I would love this