Odd sized corner tub, Maax Advanta 6054

I am building a house in Florida. It is of concrete block construction. My mason messed up with a dimension and I have less than 60" on one wall for what was supposed to be able to fit a 60" x 60" corner tub. I found a Maax Advanta Cocoon 6054 (60" x 54") at Costco for what seems to be a geat price ($1300). Only problem is I can't see, touch, feel it before I order it so I don't know if it is a good quality tub. My search for other manufacturers with similar products didn't find much of anything. The plumbing supply store I am dealing with didn't have much luck finding anything either. Does anyone have information on the Maax Advanta line or first hand experience with them? Can you recommend other manufactures that have odd sized tubs? Any help would be appreciated.