I hear good things about the Pfaff 230 and I hear things like what is above. It's a decent machine, but fussy.
I have a Pfaff 130. A super machine, even though he is on my meching bench now because I tried to do bobbin work with him and he didn't like it. Should be a quick fix. Pfaffs, especially of that era, are very intolerant of any stray thread or lint in the bobbin area. And they are fussy. But once you understand their idiosyncrasies, they are great machines. (That said, they are so fussy that I would not buy another.)
If you are mechanically inclined and patient, and bearing in mind the warnings above especially about parts and the belt, go for it! Pfaff destroyed all extra parts some time ago and parts are very difficult and expensive to find.
Cricket