GaN FET Amps vs. Traditional Class D Amps

"Basically I’m trying to understand what all of the fuss is about." 

Current flavor du jour explains the fuss. Where it goes remains to be seen. Current owners are still early adaptors. 

I fell down the Hypex NCore hole and convinced myself Bruno Putzy’s NC1200 monos sounded as good as the big Class A amps I owned at the time but, after spending quality time with them, I decided they ultimately didn’t. The NC1200 amps were simply not as natural sounding, at least to me.  As with regular Class D, advantages of GaN FET include size, cost, and lower heat.  As pointed out, there are potentially performance benefits. I am still not seeing much GaN FET with higher power ratings, although the monoblocks from Mytek do look interesting (link), and pricy. 

This isn't 1973. Today's Class D amps should be preferred by any audiophile if they want to hear what the music is actually supposed to sound like. 

I own a 2K Peachtree GAN FET amp and an Aavik Pascal Module Class D amp ( the most expensive Class D Module to date @ 20K. The Aavik sounds in a different league ,HOWEVER...the Peachtree with a quality tube preamp is a delightfully musical experience. I have the Aavik to match the wonderfull highly regarded Borresen X-3 speakers......but the Peachtree drives them beautifully also and very musical I might add !

@agisthos - So at that time, Putzy's NC1200 Hypex amps were being hyped in the reviews as "better than Class A" with many adaptors happy to finally have an option for good sound with the conveniences of low heat and small size.  At first, they seemed to sound good with rich tonal qualities through the midrange and tight, powerful bass but, over time, I noticed things that just didn't sound as realistic as with the Class A and AB amplifiers I had owned.  This review (link) describes pretty much what I heard, and specifically:

"All notes were there but the illusion of musicians standing in front of me wasn`t convincing at all. The music didn`t sound inviting and involving, it was just… there.
The emotional content was missing and the tonal colours were somewhat bleached. For lovers of analog reproduction and concert goers the sound could also be quite fatiguing and plain boring."

As to my amplifiers, I had previously owned a pair of Clayton Audio M300 (Class A) monos, which I sold after purchasing the Acoustic Imagery Atsah NC1200 Class D mono amps.  When I sold those Class D amps, I purchased another pair of Clayton M300s.  Shortly after, I purchased a pair of Lamm M1.2 Reference amps, which also sounded very good but sort of ran out of steam with my low'ish efficiency Aerial speakers and so I ultimately ended up working with SMc Audio to build me a pair of high-powered monoblocks constructed from two DNA-1 amplifiers.  The two DNA-1s were totally rebuilt using SMc Audio's new boards, low-noise Plitron transformers, Gravity Base, and everything they could do in 2020.  The SMc Amps sound great and I have no desire to make any other changes.