I didn't end up birthing in the tub, but spent much of my active labour in there. By the time I used it, I was no longer comfortable pacing/stomping around which I's been doing previously. It worked great for pain relief, along with music, and bashing my hairbrush on the side of the bath during contractions. Unfortunately I had to get out half-way through pushing to get in an ambulance &go to hospital... But was otherwise quite happy with it.
Just keep in mind that you don't know what will be comfortable for you until you're in labour. I've known people to plan water births and then find they can't stand being in e water when the time comes. S some backup ideas might be handy.
Best of uck!!