Had a Corbin Classic with back rest for a few months now. The saddle was a touch firm to start with but seems to be 'giving' nicely. A few more miles should see it nicely moulded. As for the backrest, Bliss!.......
'Her indoors' reckons the ride is smoother round the bend with the backrest on. Could be right as I know I tend to lean back into the rest on the sweepers.
Mike.