Is the ttartisan m 100mm f 2 8 bubble bokeh worth buying used?

Here is what the site says about that.

From TTArtisan M 100mm f/2.8 Bubble Bokeh: TTArtisan M 100mm f/2.8 Bubble Bokeh: A prime lens by TTArtisan for Full frame cameras, 100mm f/2.8. Designed for soap-bubble bokeh highlights. Specs - Maker: TTArtisan - Focal length: 100mm (prime) - Maximum aperture: f/2.8 - Made for: Full frame sensors - Mounts: Leica M - Stabilised: no - Autofocus: no, manual focus What it frames like - On full frame (Leica M): as marked, 100mm. Cameras it fits - Leica M9: Full frame - [Leica ...

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.

Quoted from this site's pages.