I have a 550 and I absolutely love it. I take a class on Crafsty about quilting with decorative stitches. Yesterday I extend the lenght of #4 stitsch and did it on a small sandwich I already Had made up. I loved it. That is the only decorative stitch I have used so far. She also suggested the 639 and the719. The 639 makes a diamond serpentine and the719 is the scallop stitch. She remind everyone to use the wide stitch plate and the walking foot with feed dogs up. I also have a book called Quilting With Your Waking Foot.