My current system does not incorporate Logic 7, but from what I have heard at a friend’s house it is no better or worse than any other available DSP or surround choice.
I personally do not like any of the current offerings, but if I had to choose one, it would be DTS Neo:6 as I feel that it is the least destructive [sonically] to the original two-channels. This is with respect to music.
I have pretty much given up on any form of processing with respect to music, I find a well set-up two channel system to be far more coherent and involving than any multi channel processing can currently accomplish. It’s a little like bleaching rice so that it looks nice and white, then adding back nutrients to try and make it wholesome again; the intent is nice, but the execution leaves an aftertaste.
Now for television viewing, that’s a whole different story; I prefer the DTS Neo:6 Cinema for all of my television viewing. I like the way the surrounds are employed better that in DPL II. Neo:6 has always sounded smoother and more coherent [to me] that DPL II. Have not tried DPL IIx, so that could change.