The MX3 will serve a huge purpose: Dual VGA/Twinview.
What really pisses me off is that nVidia still won't put these features on their full powered boards. I need dual VGA but I'm a gamer too, so I have to settle for the crippled MX boards which I don't really want. At the >$300 price point, all nVidia boards should have options for dual VGA. I'm not sure why nVidia doesn't offer it.
AFAIK, the Kryo 3 chip supports dual-ramdacs, so here's hoping they offer dual-vga with every board (which they've been hinting at). Dual Ramdac's have got to be better than the crippled ramdacs that's on nVidia's dual-VGA boards.