I have a Singer 237. I like it. Mine is all metal but some are a bit of both nylon and plastic gears. So depending on what one you have one is more favored the other isn't. They're great machines really. This is about the era where Singer was starting to put nylon gears in to their machines. I have 2 singers, the Fashionmate and a Graduate (school model) both made about the same time but the Graduate has the plastic gears like the Touch and Sew line. For the price you've posted i would seriously consider buying it. They really are great machines.
Sometimes under powered so that could be a problem. Unfortunately mine is one of the under powered ones. In actuality once i get a better motor on it, it'll probably run circles around my other machines. As is i'm more of a Kenmore collector.
This lovely lady has a video of the machine:
http://www.youtube.com/watch?v=NSLEIrvWuQI