Caldigit sent me a new fan, and, thus far (I just installed it), the noise level is WAY down. Rather than running at 5,000+ RPM, the new fan runs at 3,333 RPM (maximum). Other than the initial noise, this is a great unit.
I have a Caldigit VR, and it is very NOISY when the fan is going. The fan runs at 5,000+ RPM, and when the fan is going, you cannot speak on a telephone in the room in which the unit sits. If noise is a concern, this may not be the right unit.