I am considering buying a 17" Powerbook, but I am concerned about the slim piece of plastic that is the top edge of the CD slot. Considering how much time my heavy hand will spend resting on this surface, I can't see how it will not fatigue, and crack and perhaps hinder the operation of the CD drive. The 15" PB has a considerably larger top edge, that I have more faith in. Has anyone out there ever had an issue with the CD slot design/performance on a 17" model?