From Stan in Michigan:
I purchased the Vortex Viper 8 X 42 several months ago and I am more than pleased with them. They are bright which is good for my aging eyes and the focus is crisp. The locking feature on the diopter is great because they stay adjusted to my eyes. The twist eyecups with stops keeps the eye relief where I put it. The feature that is the most impressive is the close focus which allows a fantastic look at dragonflies, butterflies and birds that are too close. I also got the Eagle bino system harness strap, which makes light work of carrying the binoculars all day. A more serious birder than I, tried my binoculars, and is ordering the same outfit for himself.