I made the promise to my family a long time ago. My harness and system seem so much a part of shooting from a stand that I think it would feel very different if I didn't use it.
Here are a couple good topics to take a look at:
http://www.huntingnet.com/forum/tm.aspx?m=1309286&mpage=1
http://www.huntingnet.com/forum/tm.aspx?m=1307404&mpage=1