The areas I hunt are steep mountains. No hiking...just driving logging roads. Most of the spots I sit and glass are 350-1300 yards. But 80% of that is 400-600 yards.
My 8x binos work ok for it to pick apart and find animals. But when I'm looking at 500+ finding bedded animals is a little difficult depending on light.

Last year I used my cousins cheap Simmons 20-60 spotter and it was great once I found the animal. It was horrible for finding them though.
I'm blaming the cheap glass though.