Class D amps that are superior to all or most?


Recently, I have heard about some Class D amps that may be close to the best there is regardless of class. Certainly, this technology has been in development for decades. The main issue has always been the switching power supply. In this regard, I have taken notice of AGD. They have created a whole new power supply that “switches” at a frequency 100 times the normal silicon based MOSFET. The designer uses a gallium nitride based PS. Interesting, it is enclosed in the KT88 glass envelope that sits on top of his amps. I am aware of two more pricey amps that seem to be also at the top- the Solution and the Merrill. There must be others that compete for the title. After my thread, “Is there a SS amp that can satisfy a SET guy?”, I am still on the quest.
Don’t want to spend $50K!
mglik
Although not Class D, the Chord Ultima Line uses a switching power supply and runs cool.  I think technically they are Class G or H but they are phenomenal sounding amps.  I would certainly put them up against other amps in their price tier and they will be quite competitive.  Given the flagship Ultimas are $69K....
NO class D can come close to a great A/AB or great tube amp(set etc.).Ill check again in 10 years maybe. 
Are there 50K amps? Only if you pay for it.. My ears couldn't hear the difference because their to darn greedy. Dog gone ears... Will not let my hands reach for anything over 10K, from my back pocket... Ears are to blame... Bad old ears.

One opinion, one man, the only one that counts MINE...

Regards