Testing was done with the room Fresh Air not the Ductworx. However, if you look at the other testing both by the U of C and "in-house" at RGF they also used the room type product. I presume the PCO part of the device is the same system. In all probability they would produce the same types of results.
Moldi, take another look at the test protocol on the "proof" of these products in reducing microbials. In the case of K State you have 24 hour exposure on stainless steal surfaces. In the case of the U of C you have exposure in a test chamber the size of a closet. Neither say what settings the devices were set on. Neither represents what would happen in a home or commercial building.
Your experience might be positive. But I don't look at any of the data from these tests as proof of effectiveness.