I auditioned Flying Mole at RMAF several years ago. To say that they sounded utterly uninspiring to me would be a magnanimous instance of audiophilic kindness.
Thankfully, even back then there already were phenomenal music makers running in class D... One obvious example was the Bel Canto REF1000 Mk2, which I listened with immense pleasure at the rame show.
G.