In the snow, you're not moving a freakin inch. Rain, helps a little, will use the abs first, if ur spinnin real bad, like, if any of you have forgotten to turn it off, then try to burnout or race.....lol.....im sure you know what im talkin bout, it retards the ignition and cuts the gas. I leave it on when it's raining, I rather like it for that. Snow, I dont drive my car in teh snow period, and dont take the chance of driving if there's a remote possibility of snow, just dont bother.
I think it's nice to have....especially for rain, in all seriousness, my '83 capri....i actually get stuck with it, steep enough hill and a stop sign...and i can get into trouble, it's pathetic lol.