To my vast and immeasurable disappointment, Apple's army of engineers has conspired against me and produced a set of AirPods that cause me discomfort the second they go in my ears to the second they are pulled out. The pressure never lets up, and I never forget they are there. Running in particular is uncomfortable, My APP2s are wonderful by comparison. Did the fit test and everything.
Such a shame, but I must lob them back home to Apple.