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DD EX, DTS Neo:6, and DPLII all use the additional 6.1 / 7.1 channels.
I don't think DPLIIx is enough alone to make somebody upgrade, but certainly if your buy'n a new unit, I don't think I would get one without it.
My Denon 4802 is just fine, with it's DTS, THX EX, with it setup in 7.1 config.
Let us know if you do upgrade please, and your experiences with DPLIIx..... I mean if you said it was the greatest thing since sliced bread or something, then it very well could be worth the upgrade for it.
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