My new toy has arrived, and it's lovely.
It has air threading for both loopers and (mechanical) threaders for both needles, although that is a bit fiddly but I'm sure I'll get used to it.
It stitches nicely, and also does a fancy "wave" stitch. I'll put some pics up of that tomorrow. My only little gripe is it doesn't have a little bin to catch the seam offcuts. They do make one, but it sticks out over the edge of your table with a hole in with a bag attached, I reckon my big fat stomach would interfere with that!