Pros:
The Arboretum-Spiker DGC sprawls across three sections of park space to encompass well over 11,000 feet of throws if you play all 24 holes from the long tees to the long pin positions, so there's plenty there to appeal to the Advanced to Open disc golfer. We more meager arms (I play Intermediate up to Adv Grandmaster) are actually challenged from the short tees with about a third of the baskets in longer and more difficult locations than listed on the signs. Fortunately, the course also has shorter positions and even some novice tees to keep it relatively fun for casual rounds.
There are serious gut-check opportunities over ponds (like the #14 basket position about 285' diagonally across the water, with a basket only 3 feet from the edge), several huge turnover holes (I throw predominantly rhbh), where you have to hit a woods entry from 300' to set up even a view of the blind basket position, and beautiful clearings leading to ridge-hidden baskets like #5. There's a lot to like here.
The course doesn't seem to get too much non-player traffic, and most lines of flight are safe from other fairways. Generous, level concrete tee pads and a mix of DGA and Chainstar baskets make the infrastructure sound. Shelters, bathrooms, and a fantastic course kiosk (info, map, scorecards, pencils, a lost & found box) join adequate benches, trash receptacles, and informative signage (at the Am tees).
A beautiful feature of hole #6 is the memorial garden for a fallen soldier and the very special red, white and blue basket by the scenic bridge traversing the two ponds there. In all, Arboretum is a big, challenging course with park trees to shade some of your round, enough openness to let you see - most - of your shots clearly, and safe design for handling even a large tournament.
Cons:
Personally, I have to list as a con the notion that the course is a bit too big and spread out to make it a really fun round for us lesser arms. Even from the Am tees, when set up with long baskets, there are only a few holes to really let us weaklings go for it and enjoy many deuce opportunities. We're gonna take some 4's (& above) because many holes are set up for drive - approach - upshot - putt. It would be nice to have mixed in a few more ego boosters as well.
Holes 6 & 14 both angle across the same pond, so groups have to wait on each other to clear before throwing.
The fact that you have to traverse three separate park loops means there's a lot of travel between some of the holes. There aren't quite enough signs to point newcomers in the right direction, so it's advised to print a map or touch base with a guide. And the disc eating ponds really hold such a murky odor, I took to calling the one at 6 & 14 "the bog of eternal stench". Gives me mixed feelings on the guy who fishes them out 'for you' (for profit). I mean, I didn't want to go in there...
Other Thoughts:
Between a practice round Friday and two tourney rounds Saturday for the Ohio Senior Olympics, we were able to get a decent appreciation of this course at the end of a very rainy week in June (the park actually 'closed' earlier in the week due to flooding, the parks department wasn't able to mow or trim it up that week, as I'm sure they'd have liked to for such an event.
As I mentioned before, this is a course for stronger players, even though there are a lot of very open tee shots involved. As such, it's a bit more on the challenge side for me than the fun side, and folks looking to play just a fun round need to know that. You should try out Arboretum, but be forewarned what you're about to experience. For those bigger arms who like a bit of a challenge, this will be a course you're going to want to visit more than once.