I had dd2 in a birth center which had a jacuzzi but did not allow water birth. I was in the tub off and on throughout labor and happened to be in it when I started pushing (involuntarily, very sudden and intense). The water really didn't make a difference for my physical comfort at any point. My contractions weren't painful until the last hour or so before she was born, and even then, I was no different in water than out. However, was very hard to get out of the tub once the pushing started. I didn't want to move from that spot! I even had them drain the water, but the problem was my mw felt like she couldn't deliver in the tub period, it was too deep, she couldn't reach, etc. Anyway, I would say that if you don't want to deliver the baby IN the water, try not to be in it when you feel like transition or pushing is close, because getting out at that point is a PITA. ;) OTOH, I had a somewhat weird labor pattern and delivery b/c we're pretty sure she was posterior until the last 20 minutes (i.e., when she finally got into position and slid out!)