It works for some and not for others. But the water helps baby kinda float in your uterus and makes the pressure of the contractions less painful while still doing its job. You definetly need a good tub for it though. If you are trying to use the standard little tubs you probably wont get comfortable. Better to have a garden tub or rent one and set it up in your living room. I think they are great though and its what we are doing.