I don't see any contradictions in MLE's posts.
The MixAmp uses the same processing. Processing (in this case, the way virtual surround is achieved) is independent of noise floor.
In any case, isn't all this discussion of old vs new MixAmp just academic? How are you able to get your hands on the old MixAmps?
The MixAmp Pro is a good device. If you want virtual surround on consoles and need chat, get it. There is no other viable option that I can think of.
As I stated above, he said the Pro has more inputs and least floor noise. If that is the case, it isn't the same as the 2010 from how he explained it. The older ones pop up on ebay, and I have been looking at purchasing one or two.
I'm not stating, nor have I ever stated that the MixAmp Pro isn't an awesome device. I just like to take the time and make sure I'm getting the best for my money.