My spacebar key sounds weird (plastic wrap sound) if I move around my finger around it. I know mine isn't the only one, I've heard the same sound with two different MBAs in Best Buy. Mine was louder though.
I'd do just that but the screen has no gradient effect, uniform and looks perfect. Got the Samsung SSD and the machine is very quite and stays cool for the most part. IF the sound worsens over time, then I'll leave it in the store so they replace whatever they have to.