Well, I tried FMQ on the Sapphire again, over the weekend, using invisible thread in the top. Went really well for about 290 mins then broke a needle. I think I went too fast for the walking foot.
Replaced the needle, thought it was going well, until I discovered that the invisible thread had broken, fell out, went on vacation, whatever, and I wasn't sewing anything!
Rethreaded it. THIS TIME, I pulled the bobbin thread to the top before starting to sew. Went well again. Left on a high note, stopping for dinner. May go back to it tonight. Still have a few curses I haven't used yet. Will post finished product if not flung out window. :-)