I had one of these when my daughter was born. She absolutely loved it, and so did we. It was so easy to use, took up so little space for storage, and very little water in comparison to other methods. In addition to bathing, we used it a couple of times when she was upset with colic. It soothed her immediately. I suspect it feels like being back in Mum's womb.
It was so safe and easy to keep the baby's head up with one hand, while washing with the other one.
Now that I'm pregnant again, but no longer have my original tummy tub, I will definitely be buying another for this baby.