What are the best GaN Amplifiers available today?

There is fairly good discussion on Audiophile style, top contenders mentioned 

were Boxem and Apollon. Besides build quality, input circuit design was mentioned

as critical

For reasons so obvious they don't bear mentioning, Ralph has earned credibility with his products over decades. The endless essay writing challenging Ralph in seemingly every class D thread is tiresome, and I simply read all the atmasphere posts so I can learn about this technology, skip all the posturing, and try and see if any on-topic posts might be spotted among the dross.

I have the Shultz midded LSA Voyager GAN amplifier. The error is by omission not commission. It is a fantastic, clean, crystalline and extended amplifier from the midbass on up. What it lacks is that meat on the bones from the midbass and lower frequencies. My modded JC1 Parasound monoblocks and Pass Labs X250.5 amps by comparison have a bit more meat on the bones to my ears.

Since we have some tech heavies in the thread, I am hoping someone can explain the mechanism by which a ‘break-in’ period can change the sound of a class D amp? The caps? The FET?