I recently bought a B570 QE to replace my 153 QE, and I really don't like it. I thought the dual feed, stitch regulator, larger harp, and larger bobbin would be wonderful, but they aren't. I think my precision piecing is suffering from the wider spaced feed dogs. I will never do any machine embroidery, so I don't need that feature. My 153 was called a sewing computer instead of a sewing machine, but the 570 is more of a computer. Nothing seems intuitive to me. I wish I hadn't spent all that money.
Leslie