I'm hardly an expert, but picked up a Prologue 2 integrated about a month ago and couldn't be happier. I'm currently running Fritz Carbon 6s and Soliloquy 5.3s (auditioning the Fritz, so the sets are rotating in and out of the system), and the amp runs them without breaking a sweat - large room, but not head-banging levels. With either speakers, I notice a presence that was lacking in my previous SS amps and a bit of warmth that doesn't go to the old-school-tube-amp level of softness. Bottom line, the system sounds honest, accurate, and musical. Better or more experienced ears might find fault, but I'm satisfied and finding myself far more involved in the music.