Pragmatist- I have upgraded my DNA 0.5 to Rev A+ thru SMc Audio. No question that it is worth the cost and I would consider going the full Rev A gold route when resources allow. Better definition, soundstaging, imaging, deeper, tighter bass. Better in every way. Not selling the pair that I am using for bi-amping, unless I upgrade my speakers or add a powere sub, when I may no longer need the extra oomph. With respect to $, I know that I sold a DNA Rev B for more than what I paid for it (bought it already upgraded). However, I would hardly expect to recover the full cost of an upgrade/mod, just as I wouldn't expect to recover the full cost of a new or used purchase, unless I got very lucky.
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