Viking is a good machine as are most of the older ones.
I bought a Viking back in the late 70's brand new .I used it for everything clothes to upholstery fabric. It uses cams and has a bunch attachments. Its not pretty anymore paint missing but works. I have been trying to sell it for a year now no takers. I am about to start selling everything separately. Which I really hate to do.
And yes there is a group on yahoo.It is the one that helped me get it up and running again when the button hole knob froze up.