I recently auditioned the latest version of this amplifier and then compared it to the "Original" version that I reviewed more than 3 years ago (they are still both designated the "MK II"). While I was told the power supply has been changed somewhat, and the actual circuit, size and shape are still exactly the same, the most obvious difference (for most people) will be in the cosmetics. They have gone from "rudimentary" to a shiny stainless steel, almost like chrome, and the three transformers are now hidden. The retail price is also still the same, but this may not last much longer, since the U.S. dollar has dropped quite a bit in value in the last 3 years. As for the sonic differences...