One of the problems, and a big one, as I see it, is Ralph’s endless self-advertising. As if there were no other good amps or engineering approaches. There are, and many.
+1 @jim2 and I couldn’t disagree more with this statement from @inna. There are others here who are well known for shamelessly promoting their own products while also denigrating competitive products and even recommendations from other members (that I do think should be grounds for expulsion here), but Ralph is most certainly not one of them and to even imply such a thing is just utterly foolish.