I seem to remember that when the 15" was introduced (oh so long ago), the reasoning behind the non-dl was for size requirements. As in, we would love to put a really up-to-date superdrive in here, but we can't find one that fits in a 1" space. Now, here comes the 17" and lo and behold it's got a much better superdrive and still fits in 1". Did I imagine this, or did some manufacturer suddenly rise to the occasion?