The "rag" feels very thick and I would not put my hand into the fire for that but not one or the other scratches behind would remain on the display. The included Apple Cleaning Cloth is clearly better suited!
Furthermore, the iSaver is not very well suited as a mouse pad, since the folding of the packaging remain stubbornly in it and knead diligent and turn not press those wrinkles out.
For the "emergency" it's me well enough, but not a permanent solution!
So the iSaver remains mainly lie with the transport between the screen and keyboard or the "Office Mode" on the deployed keyboard.
One recommendation I speak only conditionally, since the function is not quite fulfilled what is promised, but the transport protection and the design are then again worth.