We sell them
Jokes aside, I haven't heard Feliks Audio but JCAT is solid. The knowledge this guy has, geez. And he was into computer playback a fair before it got popular, years back he already knew a lot on the subject.
I just listened to the Feliks Audi Elise at CanJam SoCal and can confirm it is spectacular....superb detail for a tube amp but with that euphonic magic I've never heard from solid state. Reasonably priced too for this level of quality.