I've had the $400 HP DM1 since May and it is a thing of beauty. Windows 7 with the new dual core AMD Fusion processor, no problem with any of the Matrix games, including WITE, Panzer Corps, WiTP, etc. (I have most of the Matrix library). Among the things I enjoy most about this little beauty is the 9 hour battery life, and that is no exaggeration, even playing games. Turn off the wireless and you can game for hours while sitting at the beach or wherever. I wouldn't trade it for a current generation tablet! With wireless on I'm averaging around 6 hrs battery life playing games, closer to 9 when limiting myself to web surfing or office type applications.
There's a simple answer to every complex question - and it's wrong.