If you try the Viper 8x32 remember to look at a pond of ducks. I compared a Viper 8x32 with my Leica ultravid 8x32 BR for a couple of days and thought they were very close. The Leica had a bit more brilliant colours and slightly better contast and flare control. On the other hand the Vipers had a smoother focus and more eye-relief making them slightly easier to use. Not much between them.
Then, after a couple of months, I looked through the Vipers again, at a pond full of ducks and got the impression the sweet spot was rather narrow compared to the Leicas. While through the Leicas most of the ducks were in focus, I had only a few of them in sharp focus through the Vipers.
All in all, I found the Vipers to be very good bins, with maybe one shortcoming.
George