@hudo Loving them! Sound gets better in time, especially in the first 20-30 hours of use. Bass is great instantly, however upper range needs time to get in shape. Bass control is crazy good, the amp is super fast and impactful. I am so happy with my system right now, never listened to any better system that sounds as good for all music genres. I hate systems that sounds great with slow jazz, but when you throw dubstep amp/speakers can't keep up. This is totally not that, it is great at everything I threw at it so far.
I leave the amp on all the time. I built a 12v relay based switcher myself, that is connected to my AVR's 12V trigger output, that switches between my DAC (RME ADI-2 DAC) and AVR's outputs. So, basically for music, I use it directly connected to RME ADI-2 DAC, and sounds crazy good.
I also removed the power light of the Apollon Hypex power amps. I can also turn the screen off on the DAC. That allows me to listen to music at night time with no lights. Love it! :D
Let me know if you have any specific question.