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Follow their blogs here. As of Feb. 2018 they are off to a great start in sharing their Grouper journey:
Getting Over the Hump with
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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 IAM Online webinar on Feb. 14, 2018 .
See IAM Online webinar. See the slides here: https://www.incommon.org/docs/iamonline/20180214_IAMOnline.pdf and recorded webinar here: http://internet2.adobeconnect.com/p03kw4etow2t/
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