I've had a few in and out over the past three years.
Two Pros ran around +11 and +15spd, depending on position.
One FOIS is at around +3-7spc, depending on position. My more recent FOIS runs a little quicker.
None of the ones I've had are in danger of displacing my other Omega or Tudor or COSC ETA watches, but none are off-the-charts fast or slow really. I honestly don't think too much about it. Just reset it once a week if needed. I'd read up enough on the vagaries of the 1861 variants not to expect HAQ levels of timing, and as I learned on these very forums, positioning makes a big difference.
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