Is the pentax hd da fish eye 10 17mm f 3 5 4 5 ed worth buying used?

Here is what the site says about that.

From Pentax HD DA Fish-Eye 10-17mm f/3.5-4.5 ED: Pentax HD DA Fish-Eye 10-17mm f/3.5-4.5 ED: A zoom lens by Pentax for APS-C cameras, 10-17mm f/3.5-4.5. A fisheye zoom; the older smc version has the same optics. Specs - Maker: Pentax - Focal length: 10-17mm (zoom) - Maximum aperture: f/3.5-4.5 (it gets darker as you zoom in) - Made for: APS-C sensors - Mounts: Pentax K - Stabilised: no - Autofocus: yes What it frames like - On APS-C (Pentax K): like 15-26mm on full frame; ...

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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