I have a Pfaff 7570 and 2140. I would not trade either machine for any other brand. They both sew beautiful stitches, you can sew for hours just trying the built in stitches. The embroidery turns out very good.
Check out www.Pfaff USA.com for more ideas using a Pfaff.
I would buy the machine especially knowing it has been cared for. Give us a clue to the price.
If I can help you with the machine please PM me. My sewing friend used to teach for Pfaff.