Please state how Nagra adapted the OEM device if you know something that Nagra doesn't care to publish.
But - then they'd have to kill him!
Seems to me that this is a pretty pointless discussion. If Nagra did make some changes, are they actually audible (which is what counts)? What are the chances of getting the two versions of the device side by side and testing? Nil, I'd say.
If you believe the Nagra version is better then buy it. If you the think the other versions are no worse and much cheaper, buy them. But I suspect none of the participants here have any particular plan to buy either. And has the Nagra world come to an end due to the supposed ruin of their reputation over this device in the quite long time it's been on the market? I think not.
Really not worth going over yet again.