Pros:
A short, hilly, heavily wooded layout.
Pulling into the parking lot, I wasn't expecting much when the main thing I saw was a sign for "The Pumpkin Patch" and a playground. (The playground is pretty awesome, by the way.) However, 9 on Top has some decent land to work with behind the playground. Steep hills with thick woods are a good combination for some technical disc golf.
And, in fact, the technical disc golf is fairly good, if on a very small scale. The holes are all short, mostly under 220', with razor thin but mostly fair lines. There's a few hyzer shots and a few straight shots that vary the angles and gaps to keep the course somewhat fresh throughout nine holes. (5) and (7) are big uphill shots, while (1), (2), and (6) provide downhill opportunities. Speaking of (6), it's out of proportion to the rest of the course, a 393' downhill left-to-straight shot that will have any player happy with a birdie two.
Other pros come with the territory of being a short nine-hole course. It shouldn't take long to play. Navigation isn't confusing (except possibly from (1) to (2)--go left). I'm pretty sure you'll be able to track down any disc, even during summer overgrowth.
Cons:
First off, it's just so small. This is probably the best possible course that could have been installed on this property, but to only have one hole over 250' is underwhelming. You're not going to get any chances to throw near full power.
It's going to be difficult or impossible to scramble from a bad drive, too. Lots of the undergrowth is very thick, so you might only be 70 feet from the basket but have no way to get closer than 40 at the end of your throw. (Note: My local partner told me that the rough is much better than it was several months ago thanks to some work days. It's not in the fairways, just off the fairways that it becomes prickly.) In conjunction with the length, this is really frustrating. The driving mindset here is park it or bust.
The amenities are lacking as well. Tee signs have distance and number with an unhelpful map. The tees themselves are all natural and vary from decent to atrocious. Chattanooga signature Chainstars stand out in the woods about as well as a crow on a moonless night. There also aren't any comfort items like benches, practice baskets, and the like.
It looks like the areas at the bottom of the hill wouldn't drain well at all and could be very muddy after precipitation.
Other Thoughts:
There's definitely a certain charm about 9 on Top with its tiny-line ace runs and big elevation drops. It challenges me to decide how highly I can rate a course with virtually no length. At the end of the day, with really thick rough and poor amenities, I ended up rounding it down to a Passable 1.5. It's a course I would return to if I lived around and wanted to see how low I could go.