Pros:
A brand-new course in fairly dense second-growth hemlock/cedar forest, Rainshadow requires precision, versatility, and a sense of humor. It will challenge you with left turns, right turns, uphills, downhills, over hills and between hills, usually with walls of trees crowding you on both sides, and a few more cluttering the fairway. You won't encounter any 1000-foot fairways here, but if you want to practice your technical shots, this is the place.
The planners did not treat this as a project that drags on for years; they opened it this year as a complete course, with a smooth gravel parking lot, fences, a big map kiosk, even little brown "Disc Golf Course" directional signs out on the highway. All the tees have excellent signs, as do the trails between fairways and shortcuts back to the parking lot. The only thing the signs don't show is the elevation changes. There's a lot of that. Besides gravel and a sign, the parking lot boasts a shiny, new outhouse and a practice basket, placed the way a practice basket oughta be: on a broad ledge, partway up a bit of a hillside. While waiting for your partner to show, you can practice uphill putts, downhill putts, and level putts, all within conversational range of the cars.
Cons:
It's not in my backyard. If you live in Seattle and want to devote a single day to playing Rainshadow, you can, but you'll get up early and drive a lot, and take a couple of ferry rides.
It's still raw. Some of the fairways look like fresh Cat tracks in the forest, because they're fresh Cat tracks in the forest.
A few places are steep enough that if you have problem knees or ankles, you'll be reminded of them.
There's no pro shop, no snack bar or convenience store, no picnic shelter, no drinking water. Just a nice place to drive to and play disc golf.
Other Thoughts:
Veterans Day is only 5 weeks short of the shortest day of the year, but it gave me enough time to drive from home (an hour north of Seattle) in daylight, take a short, enjoyable ferry ride, and test out the first 5 holes before joining up with the regulars here for random doubles (11:00 Saturdays). I could have followed the trails and signs and maybe the map stored on my phone to play alone, but the people I met led me around, gave me hints, and generally made the day a blast.
Watching from the tee as your disc veers into the forest, it looks like it's gone forever in impenetrable jungle. Until you walk up the fairway and find the trees are spaced more widely than you thought, the brush isn't nearly as bad as it looked from back there, and the disc is in plain sight. Mostly. Some of the fairways are bounded by brush that's almost as bad as it looks, but on most holes, what looks like a disastrous throw turns out to be a problem only in terms of your score.
I finished early enough to continue west to Port Angeles and a round at Lincoln Park, and still catch the ferry home that night.
The Olympic Peninsula easily has courses that justify an overnight road trip, but if you only have a day, you can still do it.
And Rainshadow is worth it. I'm definitely going back and dragging friends along.