University of Illinois Urbana-Champaign is participating in the TIER Campus Success Program.
Follow their blogs here.
As of Feb. 2018 they are off to a great start in sharing their Grouper journey with a blog on "Getting Over the Hump with Grouper": https://spaces.at.internet2.edu/x/IoBQBw
In addition, University of Illinois Urbana-Champaign presented on their Grouper deployment, with a focus on handling affiliate users, at the Feb. 14, 2018 IAM Online webinar. See the slides: https://www.incommon.org/docs/iamonline/20180214_IAMOnline.pdf and recorded webinar: http://internet2.adobeconnect.com/p03kw4etow2t/