We bought about 30 licences for InCopy, and we installed it on our Authors computers, we then tried to send them incopy assignments so they could make alterations to their books. The books are tax technical, meaning that only the latest bill and acts were inserted/updated etc.
But I think about only a small amount of our authors liked InCopy, some didn't like it all, and some lost all their work due to network backups and other things, basically a lack of knowledge with computers.
So it didn't really work out for us, despite all the in-house training we gave to the authors, step-by-step instructions printed out, phone support, and going to their office to troubleshoot.
All in all it was a bit of a disaster and we've moved away from that workflow.
I think the most confusing thing for people was the terminology of “checking-in” and “checking-out” content.
We've gone back to supplying RTFs to authors and then they insert the updates per chapter and we insert it into indesign. Which seems to be working out a lot better than using InCopy.
But that's the only time I've ever used it, probably not what it's meant for, but we tried and it didn't work for us.