The GL500, CX500, Cx650 were well ahead of their times. VERY smooth and a bit more torque than the run of the mill 500cc bikes of that time.
The 1983 CX650 Turbo I had would win more stop light races with 750cc bikes, even some Liter bikes.
It would pull almost 140 MPH and 115 all day even in 100+ degree days. I rode it from Seattle area to Laramie WY and the day temps were 104+, I maintained 110 to 120 MPH most of this trip. Son was at WyoTech and I brought him a 300 pound tool set strapped on back.
If I wanted a SHIFTER bike and found a CX650 Turbo, it would be in my garage.