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I had one as stock on a Canyon endurace. Rode it for maybe 8k km before replacing with a Chinese carbon post to lose some weight. Now its on my gravel bike and have done another 1.5k km so far.
No slippage so far - tightened with torque wrench and I'm not super heavy. I find it adds a bit of damping (like a soft rear tyre) but haven't tried any of the elastomer posts to compare. Didn't need it on the endurace but feel like it helps a bit on gravel
Do you really think so? I found it a massive PITA - damping was not noticeable but the two leafs slipping if tension on the internal nut wasn't high enough definitely was