Wonderful!! I have the free-arm version of this machine; I bought it because it's identical to the one my grandmother had - first machine I learned how to sew on!
They're nice quiet machines, I love how it runs. Mine is a little bit of a frankenstein as it turns out, and I still am not positive it's all working yet (my own laziness in not digging it out to test it now that I have received my pattern wheel), but it does a nice straight stitch!!
I also know from personal experience that these machines are strong enough to drive a needle right through an 8-year old's fingertip, nail and all! LOL
Pfaff referred to these machines in their ads as "Dial-a-Stitch", because you didn't use cams to get special stitches, you turned dials. ("You just dial for style!") Some of their ad graphics look like old rotary style phones...I love those 50's ads!