I ran the upgrade on my Pontus II yesterday. Process was smooth - just carefully follow the directions. I am very happy with the results - a definite bump in detail and imaging. Bass is a bit more articulate. I added the Iris DDC to my setup in December, connecting to the Pontus via I2S. That was a very nice upgrade. It's still early, but I feel the firmware upgrade was an improvement almost as much as adding the Iris.