Don't forget about the chair you use for sewing. This is an individual fitting thing. For some chair arms are desirable, for others, not so much. One distinguised national teacher used an expensive office chair. I felt lucky it din't fit my body, because it was so expensive. I ended up with a Swopper. It was what the secretaries in the expensive office furniture and design place used. I love it because I have better posture with it and it is height adjustable.