Toying with the idea of trying out some bar end shifter, looking at the Dura Ace ones. Have also seen brackets that fit on bars to allow you to mount them anywhere you want as thumb style shifters. Anyone give me some feedback on how easy to use and accesible the shofters are with either method. Also is it possible to change back if you try thumb option and decide you want to go back to bar end? Is there anything you do to the shifter that makes the change back irreversible?