This is hands-down the most pleasant experience I've had in an AC freeroam / open map, and I've driven all of them.
The visuals are great, the trees on the side of the road in parts of the map help the sense of speed a lot. The road meshes feel great for something of this size.
Took a Triumph Tr6 down those roads and it turns out this was the first time I've done 50 km in the same track in one sitting, as I got the achievement. It was that pleasant and immersive.