Neither lies the head too hard on it, as others claim. I use it now for a week and take the head without any effort from the clean-up, no difference.
"Resonant on color ring reduces the oscillation amplitude" --- I have not found.
"Bristles are too soft" writes one, another "bristles could be softer" ---- you are exactly right
I have nothing to complain about at this Toothbrushes and therefore 5 stars