What advantages, besides weight, does a carbon bar have over an aluminum bar? Does the carbon bar make a big difference in comfort? Or is it just a pricey doodad to show off? I'm trying to relieve a bit of shoulder discomfort that shows up after about an hour of riding. My bike has a carbon fork and 25 width tires which do help, and if a carbon bar is better for comfort I may start shopping for one. What say ye?