I have the Heli-bars that are adjustable and allow you to sit upright. I need a seat where I can move a little farther back. The low Sargent is great if you are shorter and need to get your feet on the ground. I now have a Corbin that is a little lower than the stock seat, so I can move back some and still have me feet flat on the ground.
I think that the stock seat works better if you have the stock handlebar placement where you are leaning slightly forward. At least for me, I have noticed that the weight distribution changes as you lean forward.
Dave