Pros:
This course is a great course for beginners and players looking for a fairly quick round. There is plenty of parking unless large events are going on, and lots of space to practice throws before/after a round.
There are rolling hills throughout the course, and many holes have some elevation changes. Much of the space is open and grassy, with scattered mature trees. These trees are well-used as obstacles on some holes, adding interest beyond simple open shots.
For a small course, Karst has good length, with a number of holes over 300'. A couple holes force shots other than simple RHBH hyzer shots, though a new player with only this shot will still find the course easy to play.
The tees are all nice concrete, and in good shape. The tee signs are easy to follow, and well marked with distance (though the pictures look nothing like actual disc golf baskets...). The park is nice, and well maintained for the most part, and the part of the park that the course is in usually remains free of other traffic.
Cons:
The biggest con is the loss of the other half of the course to be used as a parking lot once a year. Other than this, the course is nice, but a little easy. Many of the holes are wide open, and easily reachable on a single drive by an experienced player.
Update: The city has decided that mowing will be very infrequent during the summer of 2009, so the grass might get pretty tall...
Other Thoughts:
This course uses the space well, and has a few interesting holes. There are generous pars on the signs that are beginner friendly, though locals play all the holes as par 3.
League play happens every Saturday, with an alternate set of tees for each hole to make 18.