@OeKc05 – Yes, I have. I actually own a laptop radiation shield, because I don't want to risk overexposure.
I've read that the electromagnetic field that my computer puts off can cause everything from low sperm count to depression. I bought this pad that goes under my laptop, and I use it whenever I actually sit the computer in my lap.
Of course, if I'm at my desk, I can always just put it right on there instead of on my legs. However, there are times when I have nowhere but my lap to put the thing, so I keep the pad in my laptop case at all times.