My XLC Trekking bars, wrapped with old innertubes in one direction, then wrapped with cork tape in the opposite direction, to make the bars absorb shock without being "squishy." I went with a "PeeWee Herman" style mirror at the time. If I were to do it now, I'd get a helmet mirror instead, so I could turn my bike upside down to work on it! Other than that, the mirror is great!

I have them installed in the "riser" position, rather than in "drops" position, with just enough tilt to make grasping the sides comfortable. It sure affords loads of hand positions, including "flat palm" against the inner elbow and ersatz "aero bar" by grasping the inner elbow (as shown below) and resting forarms on my brake lever assembly. Also, the brakes are surprisingly easy to get to from the side holds.