Just want to throw out there my 2 cents. Using a Pimax 8kx (so 3840x2160 roughly per eye) I cannot spot anything until it is roughly 3 miles away on average. That is pretty much unusable. A friend of mine uses the Quest 2 and can always see me at 10+ miles. This makes even forming up a challenge for me and he has to talk me on. Going for the best picture possible should not result in something tantamount to punishment. (Edit: I know it isn't actually punishment and not meaning to be hateful in anyway. Just a very frustrating user experience)
EDIT 2: After playing with the mod for a few hours here are my thoughts,
Outside of 4~6 miles, there is little difference. Inside of that there is a huge difference, I am able to spot things off at the edges of my peripheral vision that I previously wouldn't have been able to see looking straight on. I will do more testing tonight and see if my opinions hold up.