I had the loan of a pair of Leica Geovids and a pair of Zeiss Victory RFs to try before buying, both in x10 magnification. Both were superb but I found the Zeiss to have a very blue tone to the image - apparently this is to do with the coatings they use to improve low light use. To be honest, my middle-aged eyes gave out before both pairs of binos, but I could still see clearly through both in fading light when I could no longer use the Swaro' scope on my rifle.
I chose the Leica Geovid 10x42 HDs in the end and have been really pleased with them. I got a range reading off a large boulder the other day at 1893 metres (nearly 700 metres further than they're supposed to range) and the detail at distance, when compared to my very good Minox HGs, is superb!
Adam.