Intersting - I need to check those two out in more detail. That issue with velocity layers is one I have with all pianos, but with the Walnut I can live best with it. I keep meaning to buy the 127 velocity layer Fazioli that Imperfect Samples do - in theory that one should work best, but that's in theory.My problem with IS Walnut Steinway is the velocity layers are a) too few and b) too obvious. When I play it at a constant velocity it sounds excellent, but I can hear the layers switch in and out. CFX and Ivory are far better illusions IMHO in that regard. THe CFX response to velocity is pretty much perfect - the tone changes as you expect a real piano to with no detectable steps.
One thing I do dislike about the Walnut Grand is that the samples at very low velocities sound far too different between sustain pedal on and off and there is, on some notes, quite a loud thunk when the pedal moves, on the sample itself, so turning of the pedal noice does not make a difference.