FWIW, I have the ExactPower 2000, which preceded the EP15A, and which I assume uses a similar design approach. All of my electronics (Denon DCD-1650AR CD player, Dodson DA-217MkIID DAC, Bryston BP-20 preamp, and Aragon 8008BB power amp) are plugged into it, and after one hour of listening to orchestral works on Thiel 3.6 speakers, when the heat sinks on the Aragon have warmed up, the ExactPower is still as cool as it was when it was turned on. More efficient? Yes, indeed. I am very pleased with it.