Milpai, I have a Terminator Plus. There was a firmware update at the beginning of June. I was using I2S from a Denafrips Iris DDC because it sounded better than USB. After the update I2S now sounds very flat but the USB is much improved. And the Iris in not plug and play now, I have to reset the pin out configuration to change between PCM and DSD.
I also bought a used Lampizator Golden Gate recently. It has a DHT tube output. I run it thru an Allnic DHT pre-amp, its not too much tubes.
As much as the TP improved after the update, the Lampizator is more musical. The leading edges hit with slam and meat on the bones the TP lacks.
FWIW I had a Yggdrassil and W4S DAC2DSD v2.2 SE, neither were as good as the Terminator I had before the TP.