My husband has the Galaxy Z Fold, and it's not a bad design overall. When it's unfolded, the display is beautiful - you really can't see the "seam" down the middle unless you really try. However, it's kind of a brick when folded, and the single screen, while perfectly usable, is so tall and skinny. What bugs me is that when folded, one side of the phone is thicker than the other because of the hinge. Cases also kind of suck. I think that if Apple does something similar, they will have to have some nice cases as options right off the bat.