Lightweight and easy to take to workshops - I don't like heaving my Bernina 730E with me, and I don't think it would do it any good either.
Cute (no contest on that one), and easy to maintain myself (brilliant, so no cost). I have a 222 which means I can drop the feed dogs, I also have a zig zagger so I have 4 fancy stitches in addition to a perfect straight stitch, and yes, I use mine to piece with.