Pros:
Heritage Park is a fun, well-maintained, and super challenging course with great amenities and a variety of challenges. There are 3 pins on most holes, extra baskets in all the par 4 positions, a practice basket, and the tee signs even indicate which pins are active.
Even if the pins were never moved, this course has a lot of replayability. With several lines on a lot of holes, there's a lot you won't understand about this course until you've played it several times. Things like how your disc is likely to fade into the woods even if you nail the first two gaps and give you a tough upshot. This course makes you remember the things that should be basics. The downside is that it makes for some more lost disc potential for first-timers, so feel free to play safe. Although the par 4's add more challenge, including a few proper two-shot holes, I also recommend you don't play them unless you know exactly where they are.
This course uses long par 3's really well. They might be a little on the hard side for most skill levels, but they do an excellent job making you take a difficult shot if you want to get all the way there in one. They also have different challenges at different parts of the fairway - gaps of various sizes, small finishes to some direction, or a challenging green.
The shorter holes have good variety as well. Some roller potential, some low ceilings, and some skip opportunity highlight what this course has to offer. And having multiple pins changes some holes in a subtle, but meaningful way - you may want a right finish instead of a left finish.
While being heavily wooded, this course does a fantastic job making most holes "in the open" while having a lot of trees around, and danger if you go off the fairway. Only holes 12-14 are properly in the woods, but all the others are close or have rough on both sides of the fairway. This gives a lot of opportunity for various types of shots while, in most cases, not offering any simple lines.
Cons:
Some of the par 4 pins are just not good. Some are on the easy side, only adding a little distance to a par 3, and while the hole is still a good design, the distance ends up being an easy 3 or 4 for most people, depending on your skill and experience. On some others, the long pins(s) give more opportunity for a super aggressive over-the-top line, which is made possible by somewhat short trees and slightly elevated tees. On these, even if your drive ends up in the woods, you may still have an easy upshot for the three, but those lines are dumb and bring safety hazards and lost disc potential into play. And the worst of these is...
Hole 10. Utter garbage hole. The short pin has an easy RHFH/LHBH line, and on the others, you're either laying up or taking a crazy line. The fix should be to cut down or trim a few trees to open up the low line, then scoot the tee a little forwards to make you take that line (probably the right line), removing the over-the-top line from play.
Very little elevation change. The course design here mostly makes up for this, but it makes a few holes be a little boring, and a few others feel a little same-y. The tee shots of holes 8 and 17 have a small gap to hit off the tee, and while the challenge is there, I don't like that when you still need a decent amount of distance to get to the green. Hole 5 also has a skinny gap off the tee that's just too skinny. And hole 16 is just the wrong way to do a water hole, but if it was downhill, it would probably be pretty fun. The elevation that is present is used well, such as the uphill shots on 14 and 18, but there's just not much of it.
The brush is super thick here, for seemingly no good reason. While it makes the holes more punishing, especially the shorter ones, it also makes the aggressive shots less fun, even if they're still the right call. Hole 1 seems to be especially eager for discs to miss the initial gap and start rounds off poorly, and holes 10-15 can give a lot of trouble as well. Even the tall grass on 2, 6, and 7 is more dangerous than it may initially appear.
Holes 12 and 13 play near Pflumm Road, and if the road is expanded to four lanes in the future, like most roads in the area are, those two holes will be in trouble. Even now, the barbed wire fence comes into play on 13 if you take a skip to the right, and the road is a little noisy and annoying, even though it doesn't come into play.
Other Thoughts:
While this is a really solid course in pretty much all respects, it doesn't give me the wow factor very much, and the minor issues are there to make me hesitate to give a high rating. There is room for improvement though - there's a pond and some more woods behind hole 1 if the course wanted to lengthen a few holes or remove some of the weaker ones. A par 5 pin for hole 1 on the other side of the pond would be sick.
There's a walking trail around holes 1 and 16(ish), but the course stays away from it pretty well. The parking lot has a lot near it other than Disc Golf, so don't be worried if there are quite a few cars.
The lake is surprisingly close on hole 16. Just saying. Feel free to bail out to the left side. Not only is the short pin that way, but being on the left actually makes it easier to get to the long pin (and the longer pin that might be getting installed in the future).