Ho can you lose here ? it add a bit of clunk to typing and if you type for a living at 90 word a minute . . well save you $ 2.78 . . if , like I , you sneeze , and accidently spill thing once in a while . . its great insurance . try it . . -lrb- Update -rrb- a few time I have look down at my keyboard cover and find `` dry foreign stain material '' . thank goodness I have the cover ! clean up with dish soap . it do kill the back-lighting for the keyboard . I just pull it off when work in the dark . if you want to use it in a professional situation involve a darkened room , forget about it . well . . again we be talk $ 3 here ...