I have had my 2009 prius for 5 months and I am scared to drive it in the snow.
I SLIP AND SLIDE ALL OVER WHEN THERE IS A LITTLE RAIN!
I have the all weather tires, so I hope that helps, but my prius is the worst tire wise, In my 5 months I have blown 4 tires.
I cant stand the lose of power, I have almost been plowed into everytime I try to dart out and make a turn.

On the positive side, My prius has been 103 MPH, I whip around in it all the time, I am always the fastest on the highway, going 75-80. Heads spin when I whiz past racing kids.