I got my today -- haven't really used them except to test them out (sort of housebound with a bum knee right now).
In the setup they have a option to test the fit, which is kind of cool. I'm guessing it uses the microphones to match the tones it plays -- if it gets a lot, then you don't have a good seal (just guessing here)
I like the controls. I'll bring them on my next trip in December, but I'll still bring my Sony WH-1000XM3