The transmission hardware is the same(no, it's not DCT) but the SAT software gives you quicker shifts plus it adds rev matching on downshifts as well as launch control(in 2014+ models).
Resale impact should be minor since SAT is a $500 option.
I haven't compared the responsiveness to the console shifter, but I assume it's sending identical commands to the transmission as the paddles, the differentiator being the aforementioned faster shifts and rev matching you get with the SAT.
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