I've played the demo through about four or five times on the PC so far, and I'm still having a lot of fun. I haven't managed any of these "tie a guy to something" stunts yet, though. I'll have to give that a shot. Does that involve harpooning a guy when he's next to a cylinder/drum, or what?
Vehicle controls aren't great (especially cars), but I'm getting better.
During my last playthrough, I laughed pretty hard when a grenade went off too close to me in a guard tower, blasting me through the air in a specTACular cartwheel. That round ended early when I overloaded the gas pipeline and the game froze, probably from the sheer awesomeness of what it would have looked like to see the whole thing blow up real good.
I'll get this for the PC at some point, but not at full price. This demo's plenty of fun for now.
EDIT: This speedboat stunt video is amusing:http://kotaku.com/5489502/stupid-spe...n-just-cause-2