Pros:
the greatness of the course has already been well described in other reviews. i'll just say that if you're a traveling disc golfer, which many people who use this site are, and you're looking to play a course on your way through a town, a course you've never played before and you don't know any locals, THIS IS EXACTLY WHAT YOU'RE LOOKING FOR IN A DISC GOLF COURSE.
the signage is perfect. the teepads are gigantic. there are tons of teepads. navigation makes sense. the perfect signage makes it impossible to get lost. every ability level can enjoy the course, it's both challenging and rewarding. beautiful, dramatic, varied hole design. i'm not sure you could ask for much more.
Cons:
some areas of the course obviously don't drain water well. to the point where i imagine it would shut down tournaments. the course is pro-tour caliber all day, so that could be a problem for a course like this.
Other Thoughts:
passing through columbia and want to play some disc golf? harmony won't disappoint. there's a tee pad for every skill level, and the signs tell you exactly how to get to every tee on every hole(most holes have 3). recent strong rain is the only thing that should deter anyone from playing here, otherwise it's as good as you could ask a course to be. enjoy!
UPDATE: After my last 2 times playing here, I had to downgrade the course due to lack of upkeep. This place is huge and needs a level of maintenance that the city/county/club/whoever are clearly not able to provide. It's getting run down and overgrown. No solutions for drainage issues, standing water all over. Place needs serious help.