My neighbor has a 65 acre field across the road and the long dimension is 753 yards. I can put a SWFA fixed 6 and a SWFA 3-9x42 on his sturdy fence posts and discern a marked difference in glass quality at and after sunset.
I can't see much of a difference between the Maven Rs1.2 and the SWFA 3-9x42 tho.
The Maven is a whole new animal with a fat o-ring on the elevation turret if you're in on that. Mine went from an untrustworthy black sheep to back to my favorite.
I think my closet looks like GStew's closet. The ATACR glass is better/best but it was essentially a 30oz fixed 10x for me with Mil-C.