Is the pentax hd d fa 150 450mm f 4 5 5 6 ed dc aw worth buying used?

Here is what the site says about that.

From Pentax HD D FA 150-450mm f/4.5-5.6 ED DC AW: Pentax HD D FA 150-450mm f/4.5-5.6 ED DC AW: A zoom lens by Pentax for Full frame cameras, 150-450mm f/4.5-5.6. Specs - Maker: Pentax - Focal length: 150-450mm (zoom) - Maximum aperture: f/4.5-5.6 (it gets darker as you zoom in) - Made for: Full frame sensors - Mounts: Pentax K - Stabilised: no - Autofocus: yes What it frames like - On full frame (Pentax K): as marked, 150-450mm. - On APS-C (Pentax K): like 225-675mm on full frame; ...

From Wildlife and sport: My picks: - Starting out: an APS-C mirrorless body with a 100-400mm-class zoom. The best value reach there is. - Hiking and travel wildlife: Micro Four Thirds with a 100-400mm. Light, long and stabilised. - Serious sport and birds: a full-frame body with fast readout and a 200-600mm or 150-600mm zoom. Buy used: long lenses hold their value and change hands a lot, and the savings are large. See buying used.

Quoted from this site's pages.