I have a problem with straight lines, and love my Kenmore which has a slide bar to slow down the machine. That improves the straight lines. And as jitkaau said, using a stiletto, really helps. So good to see I am not the only one. I have also used the black tape on my machine to help guide longer pieces of sewing and am seriously considering cutting out the top of my sewing desk, and setting my machine down into it, which could also improve the accuracy. Good luck.