I believe bi-wiring benefits are entirely system and cable dependent. They say that the best performance gains (if you notice any at all) would be from having four seperate runs each enclosed in it's own sheath.
I've tried bi-wiring on several occassions on previous systems including the shotgun (4 run) approach but with no sonic benefits that I could hear.
Earlier this year I converted my bi-wired Harmonic Tech Pro 9's (bi-wired with single terminations) to bi-wire at the speaker ends.
For the first time, I noticed a pretty substantial difference in the 3D soundstaging, better imaging, and an airier high end. I was quite pleased with the results.
-IMO