This was my first 50K (31 miles) and it was perfect for a first-timer at this distance. (There is also a "fun run" of approximately 10 miles which is great for those who want to experience the trails but not go as far.) It is a well-run event with a laid-back atmosphere and gorgeous Midwestern course of woods, lakes, streams and gentle hills.
As with most trail races, there are few if any spectators along the course, but the beauty of being surrounded by nature and the camaraderie and support from other runners more than makes up for it.
The course footing is dirt and not super technical, but those who are used to road running have to realize they are running a trail race. There are rocks & roots, 2 stream crossings and there can be slippery mud. In extreme years, I've heard there can be deep snow and one year there was major flooding, but the experiences and stories are epic and that is part of the allure.
This is a popular race with many returning runners each year and I know why. I enjoyed every step and am glad it was my first ultra!