Ray,
I have a alum. body Boss stitcher. It ran very rough when I first started with it but I started looking around and behind it and found that there was not much lubrication on ANY of the moving parts. (prob. for shipping) I lubed it up and started cranking out the stitches and it works like a dream!
I sew chap leather, I sew saddle skirting, I sew saddle skirting to chap leather. This thing does it all. I know that others have not had the same expierience I have had with mine but I really like mine . I work in a saddle shop and have several electric machines available to use and I do use them during the day but at home and for spending my own cash, I still like the Boss.
Hope this helps.
Rick Jorgenson