Pros:
I'll start with the basics, 18 Chainstar baskets in excellent shape, big, and caught well. Big, grippy, level tee pads - you can get a nice run up on these - you'll need it on many holes!
Quality of disc golf - holy cow. This course plays up, around, and through a series of wooded hills - elevation is prominently featured on this course, every hole requires precise, technical shots from tee to basket, and while you spend most of your time in the woods, no hole is particularly unfair with a too-narrow fairway. Hole 17 in particular feels like a Rockies type mountain setting, shooting over a wide ravine-like terrain feature.
You'll be shooting backhand, forehand, tomahawking or thumbing it whenever you inevitably wind up in some rough, taking any other manner of shot types, and will need every shot in your arsenal and disc in your bag. Distances are often long and challenging, but never patently absurd - you will need to put together strings of long, accurate shots to score well here!
Course is also free (aside from holidays, when you have to pay to enter the park), which is nice, but honestly, this is a course worth paying to play.
Cons:
Only two I could really tell, both of which are fixable:
1) Not much hole signage. The front 9 had what appeared to be temporary signs, with handwritten distance/pars, but the back 9 was just poles saying the hole number. This is likely a later step in the course building process, given its relative infancy, but is an area for improvement.
2) Only a front 9 map was available at the start of the course, and the course was fairly easy to navigate until 14-15 or so, which was a narrow muddy path. A few transitions from then on out were tough to figure out - 15->16 had no next tee signs, and is a possible "get yourself lost" point. I actually got turned back to 10 here, before figuring out where 16 was. Again, fixable with some work / better signage.
Other Thoughts:
A few guys were doing some work, clearing out brush/branches on hole #1 when I played - earlier reviews criticized some of the gnarly rough - the rough was not really an issue playing in February, but maybe this is work being done to address the rough for the summer?
Also on site at this park - bathrooms are present close to the parking lot / tee #1, and this park also features a beach on a lake, so take a dip and cool yourself off after you traverse this course - you will be hot and tired after playing Silver Fox in the summer!
Not particularly beginner or stroller friendly, so this one's probably not a place to bring the little ones, but you do have Grey/Red Fox nearby, plus the aforementioned beach adjacent to the Silver Fox course. Add this all together, and you can make the little town of Silver Lake a destination for a wonderful day of disc golf, though this course by itself absolutely would warrant a trip on its own!
Finally, I don't say this lightly, but this course has the bones to be a legit 5.0. The pure quality of disc golf, and the course composition is there for a 5.0 rating...fix some of the wonky later transitions and put in good permanent signage, and this is course achieves its perfection.