Purifi and Orchard Audio have both gotten stellar reviews, which isn't surprising based on their best in class d measured performance and state of the art designs. They are your best bets. Peachtree uses a load dependent design and a low switching frequency which does nothing to exploit the benefits of GaN tech. Their design is far behind Purifi and more akin to Tripath and their tech from 20 years or more ago. They just use the GaN devices as a marketing technique. You can do better.
Competitive class D amp suggestions
I have been Class D fun since a few years ago when i bought my first class D amp. I like the concept, in general, and all the attractive features of this class of amplifiers. I tried 4 different ones, currently i stayed with one of them that i consider to be the best among all four amps. I do enjoy and like it. At the same time, my 5 watts SET amplifier (with more than 100 times higher distortion according to the specs) gives more natural and (surprisingly) notably cleaner sound (THD of the class D amp is 0.001). The soundstage of the class D amp is not so bad but that of the tube one is still better.
I remain attracted by class D amps though.
Any fresh suggestions on reasonably priced class D amps (i mean excluding non-reasonably priced class D amps, e.g., Merrill amplifiers)?
Any comments on non-reasonably priced class D amps are also welcome (so far i was not able to audition many class D amps and am curious if there are some which could really compete with Class A).