Pros:
I experienced this course when it was in tip top shape, prepared for hosting Masters Worlds. The infrastructure is amazing, with so many wooden bridges, walls, and structures around tee and green areas. Yellow DGA Mach X baskets, that are easy to spot. Not my favorites, but they are all in great shape, right height, level. The tee signs are accurate, very descriptive, and well-placed.
There is significant elevation change on the majority of the holes. The topography is used very well. Many holes have more than one type of elevation change within the hole. (Downhill to a landing zone, then back uphill to the pin or an uphill drive, followed by a controlled downhill approach, for example.) Also, most pins are guarded by hills, trees, or both, but all of the green areas feel fair. There are reasonable landing spots around the baskets and the few that have a backstop are well thought out and well-placed. Angle control is important for every shot on this course, whether from the tees or from the fairways.
There are two sets of tees on most holes and the short(er) tee usually provides a different initial look at the fairway, not just a shorter version of the same shot. (6 holes have the same tee pad for long and short.) There are a few holes (like the monster, hole 12), where I think a perfect tee shot from the long tee would land right in front of the short tee pad.
Playing this course, you feel isolated in a beautiful wooded setting. The drive to the park takes you (from any direction, from what I can tell) through cornfields and then into a wooded area, with winding roads. Then you enter the park and wind your way back to the parking area. The tee shot on hole one takes you down a steep hill into the course and you are in that environment until you emerge from the woods back into the parking lot after hole 18. Even with occasional encounters with other groups of players on the course, Northwood feels like its own world, apart from the normal hubbub of life.
Cons:
For me, the most noticeable "con" of this course is that there is very rarely more than one route option from the tee. The task of the tee shot on most holes is to hit one specific line and you are often in big trouble if you don't hit that line and also land your disc at the right angle. This makes the course challenging in a very specific way. I appreciate the difficulty that comes from this design, but I believe the very best wooded courses offer multiple options from the tees on most holes. (Note: Some may choose backhand and some forehand or sometimes even a roller, but on most holes all will aim for the same (and only reasonable) gap.)
There are a good number of long walks between holes. Be ready for very long holes with long walks between them, including elevation changes during the holes and sometimes during the intermediate walks.
There is usually an obvious trail from the basket of one hole to the tee of the next, but some additional directional signage could be helpful.
Other Thoughts:
Positioning is very important on all of these holes. A kick or roll off the fairway will almost always result in at least one additional throw taken on the hole. The rough is very rough and pitch-outs will often be the wise choice for those who find themselves off the fairways. Having said that, the majority of the fairways are wide and fair. There is usually a way to play safe. The most difficulty with this comes from just a few holes where the fairway slopes significantly side to side.
There are OB stakes on a lot of the holes. Usually they are in spots where safety is a concern. There are many big drop-offs on the course that are "protected" by OB stakes. If you disc falls off that cliff on the left side on the approach on hole 12, for example, you probably don't want to try to climb down there and play from that spot anyway.
This course is difficult. The challenge is right there in front of you. When standing on the tee on most of the holes, it is obvious how the hole must be played. The question is if you can execute those shots. That makes for a particular kind of tough course. The strategic decisions of how to approach the holes are minimized (until you get into trouble) and the physical challenge is maximized with this course. It provides an endurance test both mentally and physically. Bring bug spray and poison ivy treatment, wear good hiking shoes, carry a light bag, and enjoy the adventure of Northwood Black!