I climbed this route last november and it still had the old 1/4" bolts. There are two 5.9 pitches that take gear (smaller cams and medium nuts if my memory serves). Also, on the second 5.9 pitch, there are some hangerless bolts that you need to use nuts on. The raps are pretty straightforward, just make sure you carry double ropes. The route to the right of it (I think it is called dream of wild turkeys) is fairly popular, and I wouldn't count on using those rap rings because chances are, if someone is following you up Prince of Darkness, someone will be on the other route. THat said, I liked climbing the route, but the moves are sooo repetitive. Small crimps on plates. After leading all of the face pitches, the cracks are a real treat, though.
Have fun!
David