Continuing the discussion from Pimax 31/05/2018 update: M1 units have left the building:
I had the same issue (slightly nauseous for several days). I don’t go anywhere near vr unless I am at 100% and the headset is headset is tuned just right (IPD/etc). I can play for hours with no issues if the game has teleport and good tracking. If not, ~15 secconds before nausea hits.