Hello, We are thinking about getting a sanijet tub--either the 710 or the 320-3260 (these seem to be the only options for our space). Has anyone use either of these? I am wondering what the differences are-ie why is one 2k more than the other???? The tub is also our shower--so am interested in how they compare with daily shower usage in mind. Any thoughts good or bad will be greatly appreciated!