I'll give a four and a half star rate becouse of some small sections and it's poor surface. But otherwise it's a great road on twisty roads through beautiful nature, little gypsy villages etc.
Different sections, different route. From narrow bumpy roads to open with nice viewpoints. Nice pass Klak in the middle, perfect and famous pass Sturec (sometimes called Harmanec) before Banska Bystrica with perfect surface from Ban.Bystrica side. Mo...
Road maybe better for big enduros. Some sections are little bit bumpy, narrow and tihgt corners. Overall it's an interesting alternativ to the main road. Near Zlin (Breznice) offen police with radar.
Faster, but very good road. Mostly good surface and good visibility. Some blind horizons. Near Valasske Mezirici more frequent measuring police with radar.
Nice rural road, most of the time with relatively new surface, with lots of twisties and some very tight corners. May surprise! Typical Wallachian countryside round you. In the end, good base point for continue through Slovakian hills.