Used optic had on my Scar 17s for about a decade.  Obvious handling marks, none affecting function. Buttons are in good shape feel soft and pliable and tactile.  Glass is nearly flawless with some microscopic scratching to the glare coating on the objective side. Impossible to take pictures; too small and impossible to see in use.  

Housing 6.5/10

Glass 9.5/10

this unit doesn't have any battery drain issues while off.