You also have to attach it to the wall, so if you move to another house or even change the location of your projector, it will mean starting all over and transferring it to a new wall is not easy.
The viewing angle of 180° makes it viewable from just about anywhere in the room.
Gray screens are often the best choice for an outdoor projector screen since it will absorb more light than white screens but still allow other colors to be displayed properly.
If you want a premium screen, you should pay the extra for the StudioTek 130.