It doesn't look very practical. I mean, you'd have to wait for it to drain completely before you can get out to avoid spilling it. You wouldn't be able to stand up to wash yourself. Also, the fun parts of regular baths, like bath bombs and bubble baths, won't be as fun, if at all... I vote no.
I would be so scared that it would lock the door and the suddenly start filling the water to the top, and then I couldn't do anything and I would drown.
I feel like the holes at the top should be a tiny bit lower down in case some people are shorter. Or even better: Have a hole every half meter or so, and if a little kid is taking a bath, plug the one below his/her height. (if that makes sense)
http://m.homedepot.com/b/Bath-Bathtubs-Whirlpools-Walk-in-Tubs/N-5yc1vZbz9m