Yeah in the grand scheme of things it's pretty good, but with all the great B roads north and south I think it should only be used as a 'needs must'. It's not fair on the cars & lorries.
The section from Petworth to Midhurst is a particular favourite.
I've only ridden the Coolham road a couple...
I was just about to grumble about it's A road status as it would be a cracking cyclists road.
The little 'needs must' sections I ride are always good rolling roads, wherever I happen to be..