Any Purifi module isn't junk! - they are all excellent.
The problem was the mix and match approach that spawned this old thread had the expected result. If you want a class D amp to sound good, you have to give it a respectable power supply like you would with any other amplifier. If that happens to be a switch mode supply, to really make it work it should be designed for the application rather than something off the shelf, even if that off the shelf source is excellent.
The input buffer can have a big effect too. Its a sad state of affairs that so many class D amps get shot down on this account.
Any bugs in either of these departments and the whole thing goes down the loo.
If these issues are properly controlled you find that a class D amp can be just as good as the best class A amps price no object.