Munchkin Duck Tub

I was wondering if anyone knew how old your child should be using the "Munchkin inflatable yellow duck bath" by Munchkin. How old is it safe for? Has anyone bought this bath in the so what are your thoughts on this?
Thank you very much:)

http://www.toysrus.com/product/index.jsp ...
He says he is recommended for ages 6 months - 24 months. I think it depends on how you rinse hair well. I think my daughter (17 months) might hold, leg wise, but I had no place to put her back to rinse hair. She has great hair, so it's not easy to rinse.

My twins LOVED this tub! I started using it when they were trying to sit in plastic tubs small (about 4ish months) and move a bit and start splashing. But you can use it sooner if you want. You can rest assured, your baby's head on the side of it because it's the ideal height. Once they are able to sit on their own they like the sound of ducks and they can move but it is because they can not drag on the bottom. It has an integrated sensor for the temperature of hot water and is the perfect size. I stopped using it and went to the bathtub, once they have been able to because then they were almost falling! I love it!

How old is your baby? Have you tried just using your bathroom? My four months has been in the deep end of the birth and absolutely love it. Plenty of room for splashing, etc.:) handbag friendly and