I had the Stealth XXX with the latest mods (I can't remember what they are called). I was disappointed. The sound was very compressed no matter what combination of switch positions I tried. I compared it back to back with an ExactPower EP15A and a Richard Gray 1200S. Both were so much cleaner sounding WITHOUT sacrificing sound stage than the Audio Magic. This was a Simaudio W5,P5 system with Von Schweikert VS4.5 and Exemplar 3910 for source.
YMMV
YMMV