Yeah, the freshness of these things is what is (still!) getting me. I've heard so many pop "remixes" that amount to little more than stretching out a song with empty filler and "tricks" like that that the term "remix" is one that I've come to greet with a big "fuck that".
But this stuff more often than not is a wholesale reworking of the songs themeleves. New arrangements, rephrasings of vocals, damn near everything. Damn creative, and most importantly, musical work by all concerned!
Can't say that I plan on diving headfirst into remixology, but I will say that it's a treat to hear something that's so technology-based that comes out a winner on the music. Definitely interested in hearing more things that do that!