I ask because I'm hearing 555 isn't quite up to the hype.
Not sure what the hype is, but 555 certainly isn't the best road for a sporty ride in southeast Ohio. But it is pretty much the poster child for the blind rolling hills and blind corners that SEOH is known for.
555 is not a giggle in your helmet type ride. The blind rolling hills and sudden changes of direction are a real mental challenge. The trick is to find a less than balls out pace that lets you flow with the road. Then it's quite nice. The half south of Chesterhill is more open and flowing than the part north of Chesterhill which is where the trickiest sections are. The twistiness mellows just north of 78.
If you want something more like a track day on public roads, then there are better options, but the blind rolling hills are what give southeast Ohio its unique vibe. Learn to ride/enjoy them and you can ride all day on endless twisties with little traffic.