I've done this in June and the road state is deplorable - in some parts there are more potholes than tarmac. My advice is to approach from the south and head up north until you get bored of the road, then turn back around. From the north side the road is very poor.
i made this part last augustus 2011 it was a great experience to do. speciali the middel part ik like the most
I have done only the southern half part of this route and it’s really great. Nice corners and spectacular views. I assume that the northern part is the same cause is marked as a scenic route in my Michelin map.