So, I’ve just removed and replaced my first sensor. I also thought the needle stayed in my arm and was relieved that it didn’t cause me pain at any point. Upon removal (and trust me, that adhesive is sticky!!), I discovered for the first time that it is a bendy tube the height of 3 quarters, laid atop one another, and is smaller around than the Omni Pod cannula.
As far as insertion pain goes, I would not call myself high-tolerance but I must say, I feel absolutely NOTHING of the needle when applying the sensor. Nothing.