There is a review in the last HIFICRITIC; they thought it was a significant improvement.
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I heard these exact amps A-B'd in Krell's room at the Mirage @ CES last year (I also own an Evo 403) and the difference was very significant.
The original Evo amps were exceptional, the new mod takes them up another notch. Yes, it can save you power on standby but the amps will require a longer warm up from this 'green' standby mode.
I am not so worried about the standby draw (I never turn my amps off) but I want the sonic benefit of the new 'e' version BAD!