Well the stitches seem to work ok, aside from when it hits a seam and wants to pull to the left, now known to most likely be the wider 9mm machine. The problems seem to be thread breaking, not shredding or anything else, just breaking, and the breaking after the fact when I use the locking (#3) stitch. When I manually lock the stitch, by turning the length down to 0.1, it works fine. All the other stitches I've tried (which really isn't many yet since it's only a few months old now) seem just fine. But I've had 2-3 threads per quilt pop right where those locking stitches are after I've assembled and/or washed the quilt (I'll notice them when doing the binding or when getting it setup on the floor to take my photo after washing it). It'll do that weird one stitch thing, then it'll do 2-3 locking stitches and go just fine, then when I tack it at the end it'll tack it just fine. It's just the starting bit, it doesn't break anywhere else. So I'm assuming it's user error, or the thread.