Mine has been great the last 2 days, today being the toughest test. I put in eco, and we've had a fair bit of snow here that is -8C hard as a rock and compacted. LIve in an ungritted village lane!!!!!! I have a steepish driveway that our other GTI just cannot handle. The R can have a little front wheel spin but not had all 4 give way yet. My first awd and love it, in the past I would never have done the trips of the last 2 days.
Please be careful. One of the problems with 4WD is that it gives a false sense of security in slippy conditions.
Of course having 4 driven wheels will give better forward movement than 2WD. However, as said above, grip comes from your tyres. 4 wheel
drive gives little extra help when cornering and no help when braking - for that you need better grip. If safety is your main priority, then winter tyres are by far the best option for these conditions.
My dad admits that his old Land Rover is crap in proper winter conditions. That's because he fits Cheapo ditch finder tyres. It's all about the tyres.
I would love to see what the VAQ diff and PS4 tyres would be like on snow. However, our A3 has 4 winter tyres so my car has not moved since the snow started. Why would I risk it when I don't have to!