I have one with about 70 hours on it. It is nothing short of being a fabulous amplifier IMO. I have a highly resolving system - Cambridge CX2 modded transport, modded Chord DAC, Sachs tube preamp, Cullen Cables silver-plated copper speaker cables, Revel F208 modded speakers. I have owned at least 20 amplifiers over the years. This amp is definitely at the top.