I think that Belles is one of the most under rated and under appreciated brands in the high-end.
David is a brilliant designer and his gear is pretty great!
I've owned a 20A, 21A, 21A Auricap and a 22A preamp.
Still have a 150A "Hot Rod" and have owned a 150 Ref, 350A, 350A Ref and a SA30 amplifier.
Would LOVE to find a pair of MB500's. One of my desert island amps...