I bought the four legs rectangular frame one with wheels and 2 shelves under the bath tub from Baby Hyperstore. Think this is more stable than the cross leg frame.
The brand is Mos Baby. It only comes in one colour though, yellow. Bought it as the size is more compact than other brands of bathtubs on wheels. Price $150.
From experience they are not as stable as the store likes you to think . after filling it 3/4 up with water ....
moreover there's always a chance of kicking the 'legs' and tripping over it or knocking tub over ... unthinkable while you have a wet baby in your arms.
And it is so very EXXXXXX.
Go for those basic one with a nice flat bottom, {they are so very cheap} .. you can always put it on the kitchen counter ( stand to bath bb) OR on top of the covered toilet bowl with a stool in front for you to sit and bath baby.
and when your child is older ... place it right on the toilet floor for them to have a fun bath time.
those with stand/legs are usually quite small... wont last .
rgds