I know people who have been using and building Class D amps for at least a decade and they do not like the sound of the Purifi modules.
Amps built with Purifi modules have no sound.
With reference to my previous comments, they may be coupled with pre-amps or DACs that are unsuitable. Like buying a car without a tow bar or is solar powered, there is no hope if you want to tow a trailer or a caravan or whatever.