Both my Hypex NCore NC400 Dual Mono Class D Power Amplifiers and my Mola-Mola Kaluga Class D Mono Power Amplifiers (NC1200) were very disappointing. Neither amp sounded very musical nor very engaging.
I eventually purchased the Ayre AX-5 Twenty amp and like it very much. The sound is different in that the sound is more natural and less exaggerated than my previous Class D amps. This is very hard to put into words. The sound is there with no artificial extra stuff around it. My Ayre amp sounds like music with no extra stuff in the way if that makes sense. I like this description since it describes what I am hearing. The music sounds natural, relaxed, and just right.
The only way to know what sounds great, is to listen using your components in your home. Obviously, I made some mistakes but, more important, I learned what sound I like and did not like.