I always had a Pfaff, with it's built in dual feed & I loved it!! It worked great for all my sewing. I now have a Bernina 830, (new style), that I bought used, it came with the dual feed as well as a walking foot. I have only recently used my walking foot & I was actually very impressed at how well it worked. I was quilting a rather bulky quilt on it & it really helped move things thru the machine, better than the dual feed. In my opinion, the larger surface of the walking foot, helps pull the quilt, or whatever thru the machine more evenly. While the dual feed is great for general sewing or piecing, the walking foot really does help with multiple layers.