Interesting, thanks for the feedback. So far I haven’t fallen in love with the quick motion. I don’t dislike it, but I am unsure if it was worth the upgrade. The roller feeling is very closed to the Arion mag I had it replaces in most ways. If anything, the erratic movement I had were translated in lateral movement/instability and are now absorbed in forward/backward movement on the quick motion. On the minus side, the Quick motion has a central beam so cleaning is much more complex that the Arion as the sweat fall on it and not directly on the ground. The Arion was all plastic (no fear for corrosion), and other has a central aluminium beam.
Power and inertia wise, no issues while on the saddle. I leave it at the middle setting and I am comfortable doing sustained 500W or just cruising at 180W with my gearing (345w T20). Still haven’t tried to get out of the saddle.