I bought this because even though I don't eat popcorn or crusty sandwich breads atop my keyboard, somehow something always manages to get in there. Bottled air is great for getting dust out but it sometimes just moves the big stuff around. PROS: The cover has a really nice soft feel to it when I type. It lessens the click-click sounds (especially with long fingernails) and just gives it a nice cushiony feel to the keyboard. It's keeping out dust, dirt, crumbs, whatever else. My son uses the laptop almost daily and every once in a while I'll remove the cover just to see how clean the keys still are. You can see the lit keys beneath it, and still see the letters when they aren't lit. It doesn't leave marks on the screen when I close the laptop lid, which I was concerned about for some reason. (I think another review somewhere said that.) CONS: It isn't free. :) All in all, I'd probably never go without one of these again.