There are two Summerland ways, the good and the bad. This road starts near Woodenbong in the north and is great riding then south to Wiangaree then a easy run into Kyogle. Better than the Lions road in my opinion. From Kyogle to Casino it is not too boring but beyond that to Grafton is dead flat and straight and I urge you to avoid this and take some of the alternatives, via Coraki, Woodburn then bit of the highway then via Laurence using the ferry is a far better ride.
I have removed the original post as it was too old, please see the map for location of this road.