Driving from West to East starts quite poorly--narrow road with rough surface. Towards the top of the col. the scenery is stunning. Needs concentration but a really enjoyable ride.
Don´t try this with a sports bike, unless you want to do it in a relaxed way, the first 20 km does not have good surface.
About 30 miles of only tight turns rising through the forest ro the Puerto del Sarrablo. Really good road if you like successive tight twisties.