Mines silent too… although I am not sure how efficient the cleaning is… I’m starting to see dust bunnies again, and doubt I’ve hit 2000 actuations yet.
Never heard noise from mine either, however I had a lot of dust at one time and had it cleaned a couple of months back, but I am getting dust again now.
The dust delete doesn’t mean ANTI dust apparently so I guess one has to be ultra careful whilst changing lenses.