Pros:
Great mix of holes:
This course will challenge you on a variety of shots- uphill, downhill, left, right, big "S's", tight, open, long (400-600ft), short (250-300 ft), etc. You will potentially throw every shot you have and will be able to give it all you have on a couple holes.
Few crowds-
I've played this course about ten times ~6 different trips through varying times of the year and I don't think I've even seen another group on the course, let alone have wait for them on a hole.
Great tee pads- large and grippy.
Natural Solitude/ amazing vistas-
This course is an organic course and since you are so far away from any large cities, you really get to take in the natural environment. The course (when I've played it) has never been overcrowded giving me an opportunity to appreciate the beauty and calmness of the land, and the views on some of the holes overlook the surrounding hillside and farmland are great- autumn is an amazing time to play here.
Carts-
John (the owner of Highbridge Hills) has golf carts available to rent for this course. It is a great course to kick back and drive to your disc- especially if you can bomb them.
Cons:
A few holes lack signage on where the next hole is- I definitely recommend grabbing a scorecard at the clubhouse, especially if you haven't played the course before.
Other Thoughts:
At a length of 8725 ft, this course is fairly long, however, most of the holes are open- many opportunities to grip it and rip it. If you miss your lines, though, you can end up in trouble- especially on the water holes- water comes into play on about 4-5 holes (a stream runs along the left side of two holes). There is varying terrain- some large downhill shots and hole 18 is a massive uphill hole that takes a few pumps to get up to the hole- the view from the top is spectacular, though.
There are many legitimate par 4s on this course with at least one legitimate par 5. The course will force you to make decisions- it may be risky to try and rip a drive out 350- it may be smarter to play a 250 ft shot in the fairway to give you a decent approach.
I come up to this complex every year or so. When I first started playing disc ~5 years ago, this course was very daunting, but now it is a ton of fun. A beginner wouldn't score very well on this one.
Lastly, I will comment on the whole complex-Highbridge Hills. If you make it up here, chances are you drove a long way, so it doesn't make sense to play just one course. The great thing about the courses at HH is that they vary in difficulty, so pending on your skill level or what you're in the mood for, there is a course that will most likely fit your needs. As standalone courses, a couple are still absolutely amazing- Granite/ Blueberry - but I'd bump the ratings up just because if the course doesn't satisfy you, you only have to walk a couple hundred feet to a totally different course- The Bear- long, tight and woodsy- very hard, Gold-very long, mostly open, Granite- mostly open, fairly long, Woodland Greens- short technical course through the woods, numerous ace runs, Blueberry- open and woodsy, some long, some short technical holes. The grounds are beautiful and calm.