I have heard the Gan fet amp ,the cheaper ones pretty respectable but not better then good conventional amps, Merrill Audio and others have starting at $16-35k
gan amps that are very good , but at that price many other conventional designs
may better it in specific areas ,nothing is perfect and all Audiophiles have a sonic preference from Single ended triode tubes, to class A ,Ultralinear,Class AB Solid state, hybrid tube -SS , class D , there are finally very good sounding in All amplifier categories. I was just listening to a Excellent Classe class D amplifier and had great clarity and sounded like a very nice vacuum tube amp with exceptional detail ,the 2200i, which was recently discontinued, their new line is better still which I was a bit surprised having owned a Audio store and 40 years in Audio it has come a Loong way since the 70s. Many good values especially in the used market if you do your home work. I am thinking about purchasing one of the top classe Integrated Excellent value,very versatile .having several great designs and 4 k hdmi on a great Blu-ray player and my Big LG Organic LED Tv, movies as well as concerts can be done all in one very good integrated amp.And look and sound a Great.
that being said one guy said it had no life . Maybe true for it was not setup properly,or not
with good cabling,even a power cord made a noticable difference in its balance
a very good indicator of a good amp it detects every change made in the Audio chain .listen in your own system then decide reviews are a good reference ,
but your ears are the best judge of what balance you prefer.