njw,
I'll be watching for responses to your question. I have a Bernina 635 with the embroidery attachment, and I am unable to use my Mac with it. There is software - is it called Embrilliance? - that is supposed to help us Mac users make the translation. I haven't tried it, as I've found it easier to use my husband's PC to download designs.
Even the Bernina embroidery software won't run on a Mac, which I find irritating and insulting - but obviously Bernina doesn't care. One of these days I may just buy the cheapest PC I can find and dedicate it to embroidery. So far I've been so frustrated by having spent so much money only to learn that I need to spend more (on a PC, the embroidery software, etc.) in order to make it work, that I've thrown in the towel. Grrrrrrrrrrrrrrrr. I hope I'll feel differently one day.
Thanks for letting me vent.