I figure I'm one of the majority who does not use a fixed safety line extending from ground to stand. I climb to my stand and then tie/clip in to a rope secured to the tree. If I have an unplanned exit, the harness (in this case a rock harness) will stop my fall. I don't need a belay device or ascender, as I have no long fixed rope to navigate. I know that a long fixed line is the ultimate safe way to go, but some things are too much weight and aggravation when going ultralight.
One unique thing about rock harnesses is their front attachment. You have to figure how this works with your bowshot, and whether it's an issue having the rope drape over your shoulder or around your side. Also, some harnesses have a more simple loop attachment such as the Pandion I pictured...others require a rope or carabiner to 'catch' (encircle) the main belt and leg belt where they meet. All harnesses are not created equal, and a recreational padded harness for use on a big wall might be ill-suited for a tree hunter.