I have a LA, only quilt for myself but do not SID on it. My Lizzie moves very smoothly and if I move at a smooth speed I can't seem to keep my lines exactly on the line, if I move slower it seems to give an even worse jerky line ( it could be the operator's fault LOL) so for SID I use my Janome with the walking foot. I have been know to LA a quilt then take it to my Janome for any SID I want to do. (I pin the SID area before I advance the top on my LA) This all takes extra time but it works for me.