Andrew:
IF I'm thinking about the right saw, $75 is not a great price, here, but instead about the "usual" price for a used one.
If it is a recent 40-450, it was actually made by Porter Cable and sold at our Lowe's for about $125.
If it IS this saw, it's just an "ok" buy because it will use pinless blades (or pinned) blades. The PC saw was a real pain to load the pinless blades and a pinned blade is virtually useless for many small "pen type" projects, simply because the pin is too big to thread through many small cuts.
It does have a 16 inch radius, and a decent variable speed motor which makes it ok for bigger projects, just NOT ideal for pen work.
Respectfully submitted.