I labored for hours in a la bassine tub w/ #1, but got out because pushing wasn't very effective. Gave birth on the birth stool. My second was born in the tub, but I only got to labor in it for an hour or two because I was going fast and there was a little trouble setting the tub up.
The biggest benefit of the tub for me was the buoyancy, all that water took away that heavy, awkward late-pregnancy feeling and let me easily move into whatever position worked for that particular contraction. I moved a lot during my first labor. Things were pretty intense by the time it was ready during my second labor so I found a good position (kneeling with my legs wide apart, leaning onto the side of the tub) and just parked there until the baby came out. I was able to let my belly/pelvis just float freely in that position, which was great to be able to relax all the muscles in my back and belly.
The body temp water didn't bother me at all. My first was born in late July and we had no a/c. I was able to keep a comfortable temperature with the water evaporating off me (and some occasional fanning and cool wash cloths). With my second I had a huge hot flash during transition, my mom was pouring ice cold water down my back, dh said my skin felt freezing to touch, and I was still complaining of feeling SO hot. I wouldn't have wanted the water any warmer.
Also, I found the sensation of the water being poured down my back very distracting from the pain. It only happened because of the hot flash, but next time I plan to remind my team that I found it really helpful.
I liked the la bassine. It has handles on the inside if you need to grab onto something, and the walls and bottom are inflated, making it very comfortable to kneel on and lean against. The liner fits very snugly against the tub and around the handles.