I have 5 Super Zero 2s. I watched the entire MIB3 in stereo with even realizing it. It might have actually been a little better than when I use the center. And I sit almost in front of the left speaker and yet voices were dead center on the TV.
So I sometime question the need for a center if you have decent L/Rs.
Klipsch RF-62II, RC-500, RS-400, SVS PC12+,
Def Tech SC8000
Harman Kardon AVR 1600
PS3, Apple TV, Sharp 70" Qattron