A few days ago I was sent a Rearth Silicone Keyboard cover/skin for my 11" MBA. I said I'd review it. Overall, it seems to work pretty well. I had previously bought a keyboard cover at the Apple store years ago for my 2006 Macbook which I also used on my 2009 Macbook Pro. That older cover was also silicone, but was substantially thicker than this new Rearth keyboard cover. The older cover was so thick that it was significantly harder to type and I generally only used it when I thought there was a good chance I might spill something on it. This new cover fits pretty well. Is thinner and doesn't obstruct keyboard use much. I'm not sure if its the thinnest you can get. I've seen other folks discuss thinner covers. Thinner would be nicer as long as it doesn't rip. My biggest concern with this keyboard cover is the edges. The keys on all the Macbooks sit in a well. If you spill something, its not going to run off, its doing to get funneled down in between the keys. If the keyboard cover covers all the keys AND extends over the edge of the keyboard well, you have a chance that the liquid won't go down between the keys. For some reason, this Rearth keyboard cover has sculpted left and right sides which go into the keyboard well between rows. It looks like maybe... if you spill something, these indentions might give the liquid a chance to get around the cover, get under it and leak under the keys. I'm sure its better than nothing, but having these indentions somewhat defeats the whole reason for getting a keyboard cover. The top and bottom edges seem fine and are not sculpted. Any other comments on this or other keyboard covers?