I think the problem with this picture is that Dell's 17" laptop already weighs at LEAST 8.6 pounds... If you scale this up by the same percentage as the PowerBook 15" to 17" (which is completely inaccurate, as the increase would be MORE than this, but as I don't have a numerical mind like Doctor Q, I can't give you perfect stats), Dell's 19" would weigh at LEAST 10.5 pounds, and probably quite a bit more.
I can't see carrying that beast around, lol.