I hope he doesn't mind my linking, but we *do* have another opinion based on track experience:
http://www.s2ki.com/s2000/topic/9727...review-part-2/
[XP10 fronts with XP8 rears on a BRZ]
>>>I've reached the conclusion that
staggering the brake pads (XP8 in the rear)
was a mistake. I was unable to trail brake for any of the turns effectively. The car simply refused to rotate under trail braking; instead it just plowed.<<<
However, another thread in these forums suggests the crux of the trail-braking understeer problem might be to do with electronic "aids" (from which, God save us...).
Still, I don't get, never got "staggered" brake pads. Don't see the need to purposely underutilize the rear brakes if there aren't any stability issues (which I've never had with non-staggered pads).