Hifial,
After reading the many PS Audio claims and accolades on this product, I don't recall they ever stated that it would take many hours of burn in to sound better than their previous product. The impression I got was that, as soon as the unit was plugged in you could tell instantly the superior sound improvement.
So, with blind faith I have one on order and hope to get it in a couple of weeks.
Now, I truly believe that all components sound better after they have been used (burned in) for awhile. Heck, I even own an Audiodharma cable cooker.
Now, you and others are stating that it needs many hours of burn in to sound better than the previous model, the PW II.
It is a little unnerving to have prepaid for an item with this rocky ("hope and change") kind of performance. Not to mention that it costs a little more than chump change.
So, I thank you for your posting and I guess I'll just have to try it for myself. Yet, I still have to wonder how you can design a product without knowing the final result?