I have a pallet puller (
http://www.northerntool.com/webapp/w...70_47891_47891)from Northern I bought before the Brush Grubber with the rotating heads came out. The pallet puller is much more heavy duty but the rotating heads are priceless. Thumbs up with one caveat- for really big stuff/really big tractor you'll probably tear it up. They now have a heavier duty model.
BTW Sportsmans Guide has the regular one for way less than Northern...
http://www.sportsmansguide.com/net/cb/cb.aspx?a=455869