Art, I just had my D-1x upgraded and purchased the evolution K-5x and V-5x. Previously I had the "regular" K-5x/V-5x combo (long story) so I am familar with the sound. In a word, the evolution upgrade is "mind-blowing" (I guess that is two words). Not sure what magic the "e" upgrade employs but the difference is huge. I cannot think of a better use for your money than to either upgrade your current Ayre products or buy them new. Rumor has it one of the major mags is doing a before and after review of the D-1x/K-1x/V-1x that will confirm the above.
