Videodrome,

I'm not the most discerning listener but i did spend a few hours with some good movie soundtracks after I went 6.1, and I didn't notice any anomalies with the rear channel (6th).
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Model 1070
Toshiba HD-A35 & Pioneer BDP-51
Tivo Series 3
Elite 50" / Aquos 32"
Squeezebox Radio

Stereo Setup:
NAD C326BEE (50Wx2)
Elite DV-47Ai Universal SACD/DVD-A
Citypulse DA7.2x II + TXCO DAC
B&W 685s
JL Fathom F112
Denon AH-D2000 Headphones