Here's a clip from a Gas Gas test ride day in Finland this winter. The driver is Juha Laakso.
http://www.youtube.com/watch?v=aNP8r-7c7F8
He's pretty fast and they also told they really liked the 300 2-stroke, even the beginners really liked it, said it was easy to ride, didn't really matter if you used 2,3 or 4th gear. Good news!