It lays over the keys and slightly sticks on because of the silicone, so it stays on when it's at angle and on your lap, but will fall off if you over turn your laptop.I have the Dell Inspiron 13-7368 laptop and it fits pretty well.Edit: after typing on it for a bit.
I bought this keyboard cover for my brand new XPS 9550 and it looks great!
Technically, I could also say yes because the covers letting isn't aligned perfectly with the key's lettering so the lighting shows through just a little, though not enough to be used to actually see the keyboard in a dark room.3.
This means there's a bit of a lip from the cover that you might accidentally bump if you slide your hand against one of the edges, which will lift the cover.
I like the color, it fits to my computer and it was a good price.
It will ruin your screen, trust me.