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Personally i was happy about it except one thing that I don't think it is properly magnetic sealed,when i placed my watches on it ,my watches tend to run fast than it should,a +5s/day watch will be +10s,a +3s/day watch will be +6s.Otherwise it is pretty good.
And yes,I think it requires different collars for different sizes of watches,someone should contact massdrop about this.I got the large one and it fits most of my watches but requires me to squeeze it quiet a bit....
In the case of magnetised movements, the damage to timekeeping would be semi-permanent, in the sense that the change in accuracy would last until you get the watch de-magnetised.
A lot of the variation comes from the positioning and if the watch was regulated to the same position as the winder.