Stereo vs dual mono (250/800, 200/400)

[Confused]

We have the 250 vs 400 thread, but what about the experiences of those who started with a stereo Devialet and then moved up to dual mono? I did think of starting a 250 to 800 only thread, but I suspect there may be some interesting commonality with the experience of those that have gone 200 to 400. So all dual mono upgrade experience welcome here!

Any interesting experience out there??