my current MBP is a 13" and I find it hard to use on my laps as the computer is just too narrow to fit comfortably on my laps. I always have to sit with my laps real close together to get the 13" MBP to balance well. How well does the 17 fit as a more "true" laptop? Does it balance well on your laps without having to sit real tight? Is it really that painful to lug around? I bought a backpack specifically to be 17" MBP ready a few months ago. Is it really that heavy? I travel semi-frequently but I don't intend to use it much in flight as I have an iPad to keep me busy. Anyways, I usually end up in exit rows or bulkhead seats so I think even the 17 should be fine there? side note: I was originally looking to get an 11" MBA, but now I'm considering the behemoth 17" instead. In the end, I think big screen, quad core, and awesome graphics will win.