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It's also worth noting that duration information doesn't transfer very well. If you have a task listed as 8 hours in OP, when it transfers over it will get a start time/date of whatever it was in the OP document, a due time/date of start time/date + 8h, and a duration of 8 minutes :-)

This is with the latest OmniPlan (OmniPlan/1.6/1.6-beta2-v143.10) and OmniFocus v77.9.0.103621. I reported the bug back in mid-June, but it clearly hasn't been fixed.