GaN-based Class D power amps (Corrected OP)

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 on the market: 

AGD Productions, with their Vivace Class D amp ($15k per monoblock pair, 200W into 4 ohms). 
http://agdproduction.com

Review of the Vivace Class D monoblocks at this link:
https://positive-feedback.com/reviews/hardware-reviews/agd-production-vivace-gantube-monoblock-ampli...

Merrill Audio, with their model Element 118 ($36k per monoblock pair, 800W into 4 ohms), and Element 116 ($22k per monoblock pair, 600W into 4 ohms).  
https://merrillaudio.net

Review of Element 118 at this link:
http://www.enjoythemusic.com/superioraudio/equipment/1018/Merrill_Audio_Element_118_Monoblock_Amplif...

Technics SE-R1 Class D stereo amp ($17k per stereo amp, 300WPC into 4 ohms)
https://www.technics.com/us/products/r1/se-r1.html

Preliminary review of the Technics SE-R1 at this link:
https://www.stereophile.com/content/technics-se-r1-digital-amplifier

Technics also has a lower priced (~$4,000) GaN-based class D server/integrated amp that includes a GaN FET driver stage:
https://www.technics.com/us/products/grand-class-g30/network-audio-amplifier-su-g30.html

A review is available at this link:
https://hometheaterhifi.com/reviews/amplifier/integrated-amplifiers/technics-su-g30-network-audio-am...

Anyone listened to or own any of these amps?

[Note: this is a corrected, Original Post of an earlier thread having the same name.]