Steve how sensitive do you find the "eyebox"
Not asking me, and probably asking about 12s instead of 10s, but maybe its worth something anyways.
For me, out of the box: disappointed. If your eyes are bulging out of your head you might be able to get in there enough to see the field stops from the factory setting (pos 7, fully extended).
Said the endless FOV was marketing nonsense. Later that day I cranked the caps completely closed and floated them out in front of me. Almost zero edge and a massive image. Hmm...
Fiddled around with IPD and cup position for a while, got it where my eyes could see the field stops (the black ring youre used to seeing from looking down the tube isn't tube, its the insides of the eye cups on these things) then again a few days later, because I could see the edge, but wouod get blackouts as soon as I tried to look directly at it, then fiddled again...
Sounds like a pain, but I don't think they're particular per se. I just think a massive FOV makes it very hard to determine where the correct position actually is, and trying to get all those things juuusst right when you aren't sure if the other adjustment is even right makes it seem harder than it is.
I ended up in the position two clicks from extended, and have never had to do anything besides lock them out on every other bino I've used. 2 clicks in lets me relax, 1 click in makes me snuggle up to them a but also helped me figure out the correct IPD. Fully extended... Couldn't see the edges of the glass, just that "wrong eye relief blur."
I think if you had a helper, pointed those things at something bright and either made sure your IPD was correct by looking at the projection or measuring it on a paper background, BEFORE trying to find eyecup position, you'd have an easier time than I did. Buddy could help see how far you float the lenses from your face and adjust from there, but I think the correct IPD will help the eye relief sort itself out. I did it backwards, and spent a lot of time messing with them.
So.. sensitive to be perfect, but not sensitive to better than what ya already got.