Is the yongnuo yn25mm f 1 7m worth buying used?

Here is what the site says about that.

From Yongnuo YN25mm f/1.7M: Yongnuo YN25mm f/1.7M: A prime lens by Yongnuo for Micro Four Thirds cameras, 25mm f/1.7. Specs - Maker: Yongnuo - Focal length: 25mm (prime) - Maximum aperture: f/1.7 - Made for: Micro Four Thirds sensors - Mounts: Micro Four Thirds - Stabilised: no - Autofocus: yes What it frames like - On Micro Four Thirds (Micro Four Thirds): like 50mm on full frame; f/1.7 gives about the depth of field of f/3.4 there. ...

From Buying used: Buying used: Cameras and lenses are built to last, and many photographers upgrade often. That makes the used market one of the best ways to afford good gear. A body that's one or two generations old is often most of the camera for a fraction of the price.

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