I have a Bernina with the 9mm feed dogs and love it. It is more versatile and I have no trouble with the 1/4" seam. I use a 1/4" foot. I leave the wider plate on so I can move the needle if I want to. I think the name of my Bernina is the 430QE but with the 9mm feed dogs. It makes beautiful decorative stitching. I wouldn't hesitate to get the 9mm again.