I know they say not to use a keyboard cover with the retina Macbook because it can damage the screen on the laptop. However, I have a screen protector on my Macbook. I know it's overkill but I have plenty of clients who like to touch the screen like it were an iPad and it makes me cringe so I just threw one on so I don't care anymore. But I'm wondering if now that I have a screen protector, it wouldn't damage the display to use a keyboard guard since it won't leave any prints directly on the screen. Any thoughts?