Pros:
The Canyons at Dellwood Park is a must play, as simple as that. This is one of the most scenic, picturesque multi-use parks I have ever seen. With a historical background to the park itself (the parts of the course between the canyon walls used to be a lake!), a feeling of serenity comes upon you as you enter the Canyons and you haven't even thrown a tee shot on hole 1 yet.
This course has it all, and then some: absolutely stocked pro shop on site (packed with some incredible folks), several practice baskets to allow for warming up, an abundance of parking, bathrooms, benches, garbage cans, you name it. The amenities offered by the LTPD and Dellwood Disc Golf are second to none.
Getting into the course itself. 27 holes with numerous loops available to construct a convenient 9 or 18 hole round for your enjoyment. Holes 4, 6, 9, 10, 11, 12, 13 & 18 offer two basket locations in at all times for you to select which pin to play. Almost every one of the original 18 holes have a long tee pad. The options are endless and the course can be configured to suit all levels of play.
I think the coolest aspect of the Canyons is that you will argue with yourself when it comes to identifying a signature hole. There are multiple. From the hole 16 Canyon shot, to Hole 4 offering a quite unique and scenic downhill death shot. One of my favorites is Hole 6A, a dog leg right Par 4 with a colorful mandatory in the middle of the hole, playing along a creek the entire 480' of tree infested fairway with the basket perched on a mound.
Cons:
No real cons to speak of here. The park district is the most responsive and proactive group I have EVER seen. They address issues before they are even problems on the course.
The only thing I can think of to add here is the famous Yogi Berra quote "This place will never make it, it's too busy!!!"
Other Thoughts:
If you live in the Chicagoland area and have not made the trip out to the Canyons, PLEASE venture out and play the best course Illinois has to offer, however YOU want to play it. Be sure to buy something from the shop and say hi, they are very friendly people!