GaN-based Class D power amps

The use of GaN-based power transistor tech is now emerging for Class D audio power amplifiers. Seems appropriate to devote a forum thread to this topic. At least 3 companies have commercial class D amps in their books:

Merrill Audio, with their model Element 118 ($36k per monoblock, 400 W into 8 ohms, 800W into 4 ohms), Element 116 ($22k per monoblock, 300 W into 8 ohms, 600W into 4 ohms) and Element 114 (coming soon).

Review of Element 118 at this link:

ADG Productions, with their Vivace Class D amp ($15k per monoblock pair, 100W into 4 ohms). (The designer emailed me indicating he has another product in the pipeline.)
Review of the Vivace Class D moniblocks at this link (warning: link might not work (1/11/2019)):

Technics SE-R1 Class D stereo amp ($17k per stereo amp, 150WPC into 8 ohms, 300WPC into 4 ohms)
Preliminary review of the Technics SE-R1 at this link:
Technics also has a lower priced GaN-based class D integrated amp in their catalog:

Anyone listened to or own any of these amps?

Thank everyone for explaining. I read this as well which to me is showing what roberttdid is saying about the square wave. If the phase shift is distorting it would look like figure 3. In the link.
Post removed 
Again, who cares who is right? Let George have the last word or this will go on forever.  Some people want to learn, some want to argue.  Decide not to argue.  Let it go.  Peace.  
Post removed 
1) No, that is a pulse train with infinite bandwidth and perfect phase. It's not reality.

2) That is a 10Khz square wave and actually looks quite good. You don't know for certain that's a phase shift issues without looking at the phase shift (in time!) at harmonics at 30Khz, 50Khz, 70Khz, and given the module bandwidth that is going to cause slew issues.

I have designed quite a few audio products, commercial acoustic spaces, have patents in the field, published papers and have a few related degrees. I have shown I understand the tech, can talk in details without hand waving, and don't need to quote others words.

... And, I am still waiting for your justification for why the square wave I posted, which is a very very good 1Khz square wave, is possible if there are such big phase issues?