The bearings are fine, everything You can hear is moving air. I have set them to 900rpm and this makes them very silent to me and look very nice. Noctua industrial's is a bit louder at the same speed. Still about 2 weeks left for final pics. Have to wait for alu covers to be sent to me and then send them to be powdercoated, need new top window since I used my clear version for the 5.25 cover.