Mapman,
Using a lot of feedback to create super low distortion numbers does not make a product superior sonically to an amp that has less feedback. Ralph uses way less feedback in his amp than Purifi and it probably does not measure as well as Hypex and Purifi. Does not mean it is less REALIZED...or less good sonically. The GaNfet analog class d modules used by Peachtree and LSA were designed by listening and they preferred less feedback.....therefore less good static measurements.
There are no fully realized products....absolutely none.....at any price range. As soon as you buy the latest $100K amp another one comes along that is said to be better or the original amp manufacturer brings out an "updated or new" version.
If you go to 10 audio you will see a review of the Purifi based NAD amp ($2K) and my modded VTV Purifi amp ($1600). He gave the NAD a 7 and mine a 9.5 bordering on 10. The execution has a tremendous effect on the sound.....sometimes more than the amount of feedback or the modules being used. Truth is what you hear.....it is what you feel.....it is what you are..