I made the switch to Class D with a pair of AGD Audion monoblocks. These amps are the best I’ve had in my system by some margin. Firstly, they produce no hiss/hum which has been a problem as I have high efficiency speakers. The sound is almost tube-like but is even better!. Soundstage, dynamics and detail are terrific.
I’ve used and loved SET/OTL tube amps for over 20 years but the new generation of Class D amps use less energy, produce virtually no heat and don’t need replacement tubes. So, for me, there’s no going back and I can’t see a downside.