Just my 2 cents: I was "forced" to use an "unowned relationship" for my application because I had very large objects: My parent object "Journey" contained thousands of "JourneyPoints" in a List element. A call to "makePersistent" constantly hit the 30s deadline. By modeling it as an unowned relationship and distributing the parent key by hand to the JourneyPoints everything was fine again and the performance was very good.
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