Just ~20 min of driving time and I can tell a big difference. We've got some freeway exits that are large curves and basically flat. With the Hellwig on the least firm position it's a noticeable difference. It feels like I could take the exit at 10MPH faster and still feel just as comfortable. Also, taking quick turns like from a busy street turn lane, you can really tell how much firmer this bar is than the stock one. Very happy with it.
I did install it using the least firm position of the three options per the instructions. Apparently it's so "you can get used to it." That's about as lawyered-up and unnecessary as a McDonald's hot sauce warning. Tomorrow I'm moving to the firmer positions.
I almost think this should be stock equipment on the heavier trucks, i.e. Longhorns and Limited - especially with RamBox.