I did a snowx school yesterday and teh instructer decided we should try with no abs.
good points of ABS, you can steer very easy during a skid. Its a bit pre-emptive but it works well for that
BAD: its scary, stop time is waaaaaaaaaaaaay to long, it comes on to soon and turns off to late. its basically garbage. I refuse to use it from now on, i hav e more control. Threshhold breaking is much better than abs. In the summer with new tires ill probably put it back on, i dont want to flat spot my tires.