I also have the previous model, V2 + so from a quick listening I can say that immediately observable differences are speed, better dynamics, increased stage depth, details retrieval and even greater image accuracy. I will also try listening to very inefficient headphones but I am convinced that it can amplify them to the optimum potential. Overall it can be end of road for many audiophiles, I have nothing to reproach. Perfect synergy with HD800 / 800S. Excellent!