I think St. Ives may have won "Best New Course" honors from Golf Digest when it first opened up back in the mid '90s. I'm not sure how it's stood in recent years on Best In State and other lists.
As far as Timberstone goes, is it worth playing? Sure. Is it innovative and thought-provoking architecture? Not really. And you'll most likely only remember the last two holes: the 17th for its ridiculous drop down a cliff and the 18th for its ridiculous drop down step-like terraces.
Timberstone is typically soft, lush, and green, runs a lot of outings, and serves as a quick northern getaway for folks coming from Wisconsin, where the land is primarily flat and the complete opposite of Timberstone. It's your basic overwatered resort course with big, smooth, round contours, rocks placed here and there for visual effect, and a few ponds, all stuck on some otherwise dramatic terrain on the side of a mountain.
I'd recommend playing it if for no other reason than crossing it off your list, but I wouldn't sacrifice a day away from Greywalls or other special courses in the midwest to play it.