Pros:
The Pioneer Park disc golf course does an excellent job of using the park that it is located in. The park is located in a housing neighborhood and is really barely big enough to fit a good 18 hole course in. Fortunately for DG lovers, the course uses the space excellently to provide a very fun and tricky little course.
Pioneer is set in a hilly part of Nacogdoches and most of the holes on the course take advantage of the elevation changes. Most elevation changes are more on the minor side, but they change the shots that need to be thrown significantly in comparison to a flat hole. This makes the course very interesting and many of the shots unique. The course has a few areas that are out of bounds and some rough, but most of the holes are at least partially wooded. Few pure tunnel shots, but several where you need to pick a route and hit it.
Overall this course makes for a very well rounded disc golf experience. The holes are almost all birdie-able which makes it rewarding when you hit your lines. Most of the holes are unique and combined with nearby Pecan Park, the course is a destination worth the drive.
Cons:
There are a few things that you need to consider before playing Pioneer. If it has recently been raining, the back nine can be a swamp. Prepare to get wet and (as everywhere in Texas during the summer) be mauled by mosquitos. The rough is also filled with poison ivy. The course has a few continuity and crossover issues as well. If you don't know where you are going, make sure to consult a map beforehand. You may have to wait on pedestrians, cars, or other disc golfers before you can throw your drives off of some boxes.
Other Thoughts:
4 of the 5 rounds that I have played at Pioneer have been at the Pecan Park Open, a B-tier event that the locals prepare very well for. The course has always been in great shape due to the preparations for the tourney. I will note however that the other time that I went to the course it was also in excellent shape. The Nacogdoches Crushers disc golf club is an outstanding small club that does a great job keeping up the quality of their courses.