I bought a Devialet 400 a few weeks ago.
My speakers are SF Strads and Harbeth 40.1's.
I am amazed at how great it sounds.
Smooth, slightly sweet, wide sound stage with maybe not as much depth as my tube gear, awesome vocals, zero sibilance, super quiet - music flows out of blackness. Zero listener fatigue. I can not understand how they do it.
Out of the box, it was a little constricted and harsh. Much better after 50 hours and now with several hundred hours, awesome. It's hard to get over the fact one could be done with this unit. Old habits die hard to resist tweaking, obviously there is no more swapping components. Just enjoy. It really is unlike anything you've heard.
I really love mine. Will it stop me from looking at other gear? No. I am trying hard to resist, but my Devialet is going nowhere.