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?

PreviewAg insider logo xs@2xcelander
celander OP
  Why not be helpful
If you don’t want to contribute your listening impressions, then that is your prerogative. And nobody is asking you to endorse or demean any manufacturer.

So why is he saying it??  other motives??.

One can go and listen to the GaN technology smaller Merrill Element 116 at the Florida Audio Expo.

" Heard: Muraudio Electrostatic speakers ($15,000/pair); Merrill Audio's Element 116 monoblock amplifiers ($22,000/pair) with Gallium Nitride transistors and zero feedback, Christine Reference preamplifier ($12,400), and ANAP cabling; and Aurender N10 music server ($8000), with EMM Labs DAC2X ($15,500) and GIK room treatments."

Cheers George

Post removed 
The Lyngdorf is not GaN. Saw this on Widescreen Review, “

The output section of the MXA-8400 is a completely new electrical Lyngdorf Audio design based on the optimal use of NFB in audio amplifiers. NFB is an arrangement in which an amplifier is made to respond to a fraction of its own output signal in opposite phase in addition to the normal input signal. It effectively reduces distortion and increases linearity.”

I thought it was a taboo to use negative feedback in a class D design. But then again, I am not so certain that this Lyngdorf amp is a class D amp in the first place. See this post in the link below from one of the principal designers: