In addition to wanting to keep my new MacBook Pro spiffy, I live with four cats; not only do they shed but they track litter and whatever else sticks to their paws. A keyboard guard seemed a necessity (my Ti Book learned the hard way).
I happened across the ClearGuard while browsing the Apple Store site for keyboard protection and based on good reviews, I bit the bullet and am very glad I did. It's VERY thin, doesn't impede typing, and is almost undetectable. The only thing I'd correct is the fit on the function keys which is very slightly less than perfect--it's a bit too big at the very top. It's a minor thing but given that the ClearGuard isn't cheap, it should be perfect. Other than that, I'm very pleased. It has already protected my beautiful backlit keyboard--not to mention what's underneath--from debris and I have no doubt it will continue to do its job.