Ran it with a 1955 Nimbus with sidecar. Even with this limited setup it was quite fun, the only negative was the bad quality of the asphalt, very bumpy. I can imagine what fun it would be with a modern bike.
This road is bumpy and twisty and not fast but best appreciated when pressing on. I use it to wake up the clients of our b+b at the beginning of a day out. It takes longer than you think to complete