As an owner of the sister models for these, the Dell switches are not designed to be quiet or kept near an area that needs to be. These are not loud hurricane switches like other models but they do generate some noise. This is a great deal if you got your equipment in a seperate room/basement/lab where the noise is irrelevant. For me they were too loud to be in my network closet and lab and had to be replaced by quieter ones.
Great deal for someone to get a kickass stacking switch.