Really interesting post - could you post the percentage of machines that need repairs within the first year?
Apple are so tight-lipped about these things, and it's really hard to get some concrete figures about this kind of thing, so if you could that would be ace! And I'm sure, I'm not the only one would be interested
However, with the magsafe problem - that was with the first generation models (as sites like AppleDefects point out) and Apple phased these out in Dec06/Jan07, and exchange these no questions asked, so I'm not quite sure why you've included that.