I own a Odyssey Stereo Stratos Extreme amp in my main rig and had a Rogue Cronus Magnum in my secondary rig. In my main rig, the system is worth upwards of 40K and although I have replaced most of the other parts of the system, I feel the amp is more than up to the task. It is slightly on the warm side of neutral, the highs are extended and very smooth. The bass goes extremely deep and vocals seem spot on. I am driving a pair of Golden Ear Triton 1 speakers and previously was using Odyssey Kismet speakers, DeVore Gibbon 8 sperakers, Von Schweikert VR33 speakers and Vandersteen 3A speakers. Never once have I considered changiing the amp. I compared it to the Parasound A-21 amp and the Odyssey was much better on my system. The a-23 is a smaller amp I believe.
I used my Rogue Cronus Magnum amp in my secondary system driving a pair of Golden Ear Triton2 speakers.. It sounded good but not spectacular. I sold the amp and bought a Parasound Halo Integrated which is essentially a Parasound A23 amp and a Parasound P5 Preamp and in that system, sounds better than the Rogue.