I had two children naturally. I didn't have the option for a water birth, but I was able to sit in the jucuzzi tub during labor. I highly recommend the soak! For both deliveries I was stuck at a 3 or 4 for most of the day. After getting in the tub, I progressed very quickly. My first one came only an hour after getting in the tub. With my second one I barely got settled in the tub and was dilated to 10! Both of my deliveries were very easy. I can't say it was or wasn't the water, but next time I'm getting in the tub as soon as possible!
As someone else said before, the most important thing is going home at the end with a healthy baby and mom.