Pros:
This course is very rudimentary at first glance but the people who swear by it know it can be a fun course that offers a good tune up to your short game. Unlike many courses made in the early years of disc golf (1980 for this one) where the average hole length is about 240, not all the holes are simple and straight forward.
Also it's only 3 blocks from another shorter 9 hole course, so it's really an 18 course.
Vance is only 3 blocks away turning a trip to Rockwood into a nice 18 hole experience.
Fun winter tournament series running every other saturday with a large local following.
Cons:
Short, only one hole with a full 330' drive.
flat, no real elevation change.
not a particularly challenging course.
2018 Update: Sadly, due to safety concerns, hole 7 has been considerably shortened, turning a fun tricky 245 foot shot into a wide open, simple 175 foot hole. Also, a major tree came down near the pin on hole 9, making that hole considerably easier as well.
Other Thoughts:
If you live in the Portland area definitely check it out. If you're coming from out of town, your probably better off playing Pier or Dabney or Milo Mciver