I have one Harley (complete with metal dash) experience. Left for a ride to Alabama last Fall with a Road King. That bike cost about 17k and had another 8k in it. My little TBA cost about 8k and is still under 11k after numerous tinkers, adds, subtracts, etc. Anyway, the Harley broke down 45 miles into the trip. On the way back, it lost 2nd gear. Somewhere in the very slight curves of Western Fla/Ga, Harley rider told me to ride ahead as his bike was shaking in the turns, because he was riding two-up. I am not talking twisties here folks.
I am pretty happy with my little plastic dash.

Ryan