I don't know much about the Duravit tubs. I've seen their catalogs, and they are very nice looking!

FWIW, our Toto 1525 cast iron tubs (we have two) are 30" wide (60" long). They are 16 3/4" high. We are very happy with them. If your floor can support cast iron, you might want to check them out for comparison.

I just received an email from another GW'er, inquiring about how my DH installed our tubs. At our plumbers suggestion, DH installed the tubs on the first layer of plywood subfloor (3/4" plywood), and then installed another layer of plywood (he thinks it was 1/2") on top of the first layer. Mud, thinset, heat mats, tile were then laid over that. In effect, the tub is "sunken" into the floor. Makes it easier getting into/out of the tub, and I'd guess, easier on the back for bathing toddlers, or even just cleaning the tub.

(Just be sure to inform the plumber about your plans re: floor/tub so he or she can install all the plumbing at the correct heights. Also, with the dual layer subfloor, there is an impact on your toilet�s height, and therefore the plumbing height for the toilet might be impacted, incl the water feed for the toilet which usually sticks out of the wall, close to the floor).