I did not do a lot of research on the deluxe vs std. Would be interesting.
From reading post, I can see how others perceive preamps which are more analytical compared to the ear now that I am listening to it.
Unfortunately it's a pain in the a*s for me to trade many units in and out to test. In the end, I choose the ear because of the "softer" sound.
That said,I really like the results (but maybe I don't know what I'm missing).