Typically, orchestrated pieces can sound all-encompassing/grand/etc but will often lack the 'oomph' offered by electronic manipulation, the converse being that electronica can sound too removed from reality/'normal' instruments to evoke the same sort of feeling. Common sense says "Fine, throw both together, and you'll get the best of both worlds." and for once, this held true.
The blending of two very different musical types, while sounding as though it were the most natural thing possible, makes this one remix I'll be listening to for a long time.
Also, while it sounds pretty kickarse throughout, 4:25-4:30 is where it really picks up, and sounds to my ear like the two styles merge into a single composite, rather than playing off the other.