I think Valve means what they say
The lucky 300 have started to report their first impressions in the Steams forums (groups Steam universe and The 300 Club (Beta)). Many of the testers complain that touch pads are too sensitive. It seems that the SteamOS doesnt have any means to adjust sensitivity at now. Some say that FPS games are better with controller than with a gamepad.
Will buy one just for SuperTuxKart.