As John says, works fine with DNG. You can always keep a copy of the ORF if you think that Apple (one day) will do a better job than Adobe at decoding E-3 RAW, which is perhaps just possible, or you ever think you might want to use Olympus Studio or Master.
It is a pain at the OS level, since Lightroom importer can't show thumbnails, and OS-dependent apps like iView can't display anything, but.... whatever.
We Olympus users were born to suffer