Interesting, No problems on mine. They are spot on to go off and a bit slower to come back on but at least I am not blinding anybody and it is maybe a 1-2 seconds after they could be turned on if maximizing it manually.
Mine don't dim as quick as I'd like, it takes a while for it to recognise an oncoming vehicle.
Interestingly though, I had a bog standard 19 plate Jazz as a courtesy car last week, driving home from work at 11pm and the auto headlights are perfect. High beams switch off near instantly when there's an oncoming vehicle.
I’ve had no problems with it and they work a treat for me on country lanes, but do Check the camera/sensor is clean as that can impact sensitivity according to a Honda mechanic from my local dealer. It’s located behind the rear view mirror.