Actually, I bought one on Amazon in September for $70 shipped (yes for the full-size). To me, even if I never use it, it was still worth it. I could sell it for $100 easily :P

Anyways, I have yet to use it, most likely will try it within the next few weeks before I go up to the mountains for snowboarding. I have a 2wd so I imagine it will help quite a bit.

And about the sand bags, 4 bags for $15 doesnt sound like much.... until you buy them year, after year, after year! I just cant stand them sliding around back there.