DS is 5 months old and he's been showering with us since day 1! haha

I think I'm ready to start bathing him on his own, but he can't sit up on his own, so I'm thinking of getting a smaller tub to put inside the bathtub for awhile.

What are your recommendations?

I love the look of the Hoppop tub but one review read that their baby slid around all over it.. does anyone here have it?
http://www.amazon.com/Hoppop-Bato-Bath-Tub-Lime/dp/B00361B2CA/ref=sr_1_54?s=baby-products&ie=UTF8&qid=1344382546&sr=1-54