I have to say that over the period I have running my Class A mono amps, coupled with my tubed preamp, I have been loving my music again. There is a sweet spot with these mono Class A amps that allows listening with no fatigue, glare or otherwise unwelcome issues or noise. I would characterize them as "warm" sounding so it depends on what you prefer. My units have a stanby mode so the "Heat" is only an issue when in use, but they do run Hot! I have also installed some micro fans which are very silent to move air from behind the units which helps.
Overall the most musical combination I have owned and enjoyed!