Good and can be 'bad'
There have been many posts on this option in this and the solsticeforum.com sister site.
The main minus is the tendency of having both drive wheels break loose at the same time when under power (especially on ice/snow/rain) on a curve. Without this option, you would first only spin one (i.e. inside) wheel giving you a better indication of being near the edge of traction. When both go (spin) at once, you can quickly find yourself pointing the opposite direction and/or spinning around, etc.
For this car, if you are anything of an agressive driver, I would get it. If you are only going to cruise around, you probably wouldn't miss it, and it could keep you out of big trouble on a curve if the conditions are 'wrong'.
It does help in getting unstuck in snow/ice/mud, but this reason shouldn't be a factor in the sol/sky.