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I have, but it was at a former job, and I don't use it in my current job (nor do I have saved configs from my prior job).
BTW, PfR is basically the V2 version of OER. Unless you're using some old IOS, you'll probably use PfR, which does have some new features.
I liked it, but you'll probably want, or should, change some timers (basically to get the analysis time down). It also has a couple of "gotchas" (at least it did for me). Two I ran into, first, if doing active analysis, you got to be careful you don't overload your device with OER generated SLA tests. Second, if working BGP, you need to send communities to BGP peer for BGP to hold the no export OER generated routes.
Depending on how you plan to use it, you may also want to rethink how you process routes. For example, I found OER managing a pair of Internet (edge) routers, using defaults, better than accepting even the complete Internet route table.
