O.k. here are the feet you would get with the 820. "Bernina’s exclusive solid presser feet, including: 1C standard foot, 1D standard dual feed foot, 3a automatic buttonhole foot with slide, 4D dual feed zipper foot, 5 blindstitch foot, 20C open embroidery foot, 37D dual feed patchwork foot."
So, you will need to purchase the walking foot and SITD attachment. I had to also. It's great. I have to disagree with the prior posting. Bernina and my dealership recommend the walking foot for quilting. The dual feed is great for two layers, but the walking foot is recommended for 3 or more layers for the Bernina. You can try it without and see. As I did. And I found the walking foot is much better with quilting and especially for bindings. Hope this helps!