The KT88 'valve' is actually the GanFET power stage. I purchased these amps in Mkii version and was able to easily update to Mkiii status simply by swapping with new Gantubes. The Mkii Audion was fabulous but the Mkiii Audion is even better. There is more detail even at very low level and the dynamics are even more startling. I'm not great at describing things in audiophile terms but with the Audions I just feel the music is more enjoyable. 

The phono stage was a real eye/ear-opener and is a bargain in high end terms. You can make gain and loading adjustments from the Mola Mola app along with loads of different EQ curves.