The philosophy on the benefits of upgraded rear pads...?

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Just wanted to pick some brains on whether an upgraded rear brake pad is worth it or not. Seeing as how the majority of the braking is done up front, I'm just not sure how important the rear is.
This question is a general one, but my personal setup includes: Subaru 4 pot front calipers with DBA 4650 slotted front rotors, and H6 rear larger rotors with stock calipers. I also feel that my Tein Flex coilovers play into braking because they prevent some of the nosedive that would occur with the stock springs and lighten the load off of the rear tires.
So, two weeks ago I ordered Ferodo DS2500 pads after reading rave reviews. I was definitely purchasing the fronts, and decided what the hell I'd get the rears too.
What I'm wondering now is if getting the rears was unnecessary, or if its the obvious choice, especially since I've already taken the step to shift braking bias rearward with the H6 rotors.
What exactly are the effects of upgrading rear pads? Obviously fade, but I dont often hear thats a problem on the rear pads. How about brake balance? But then again isnt it possible to lock up the rears on stock pads? I'm not sure, because I think the fronts lock up first.
Anyways, just looking to hear some advanced insight on whether or not upgrading rear pads is a good idea.
FYI I have installed the front pads out of necessity to replace what I had in there previously, but the rears are still sitting in the box waiting for summer tires and the autox season.
Thanks in advance, hopefully this inspires some informative discussion...