I buy this because I have the -lrb- terrible -rrb- habit of eat while I use my laptop , since I be a university student and always use my laptop for study or entertainment , which basically describe my waking hour . I want to keep food and grease out of the key . it work pretty great for that purpose , but after a while I notice that my laptop be run WAY hotter than usual , at least twice the normal temperature , even when it be idle -lrb- it be almost hot enough to burn skin on contact -rrb- . I have hear that some of the intake for the cooling fan come from the keyboard , because of the Macbook pro 's unibody design . I think that must be true , because as soon as I remove the keyboard cover , the laptop cool back down , the cover , since it be translucent , also nullify the feature of keyboard backlight and cap lock light , so if you use those feature , avoid this product . also , the cover leave a gross sticky residue on the key that be really hard to get off , and it leave a imprint on the screen as well . if you have a specific reason you need to keep stuff off or out of you keyboard , this might be a good idea , but otherwise it be not worth it , and you should be careful that you laptop do not overheat while you be use this .