The boards have been in for over two weeks now. Given the minimal price difference £387 vs £342 for a pair then it seems the Qudos boards are amazing value for money.
Observations so far: cleaner sound, tighter bass and therefore sounds faster, the upper bass has more detail too, the midrange sounds snappier with more body - inflections in the voice are more apparent, the treble is a little more defined too. The differences are noticeable and I would make the change again but the NCC200 boards were superb anyway.
In my experience, real or imagined, burn in does seem to occur with new equipment so I will report back in another two weeks if anyone is interested. What I did notice was during the first 48 hours probably the voices were much further back in the mix and the music had lost its snap which was a little alarming for me even though my experience has been things need to burn in. Every single time i get something new I convince myself that I was imagining my experience of burn-in.