Is the leica tri elmar m 28 35 50mm f 4 asph worth buying used?

Here is what the site says about that.

From Leica Tri-Elmar-M 28-35-50mm f/4 ASPH: Leica Tri-Elmar-M 28-35-50mm f/4 ASPH: A zoom lens by Leica for Full frame cameras, 28-50mm f/4. Three focal lengths in one lens: 28, 35 and 50mm. Specs - Maker: Leica - Focal length: 28-50mm (zoom) - Maximum aperture: f/4 - 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, 28-50mm. Cameras it fits - [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.

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