Its not real challenging north of Willville. Lots of gentle sweepers. When I went down there last year, I hit it early on a Sat. morning and ran into very little traffic. Speed limit is 45mph, but you can generally get away with about 10mph over. It was a very nice ride.
I'd say its probably similar to the Cherohala, but not as high in elevation. All-in-all its a very enjoyable ride, just not real challenging.