I purchased these 10x50 Vortex Razor binoculars mostly for birding and have owned them for 1 month. I've been using some 5 year old Vortex Vipers for the past year of light birding experience.Use Pro's: Feels light in the hand, balanced, not very "fussy", focus smooth and easy to turn, close focus is as advertised, eye relief adequate.Seeing Pro's:-- Noticeably brighter than the Vipers.-- Detail is better at close range and MUCH better at distance. For example, on a fairly good viewing day I could see some detail in the feet of an Egret flying several hundred yards away. In the Vipers they looked more like a black stick and I had to work hard to see that.-- Seeing color, particularly at distance: This is hard to define as the viewing conditions are such a huge factor. I'll say seeing color is somewhere between better than the Vipers and much better. Seeing color better under our gray NW skies is a challenge, I didn't have the Vipers to compare, but with the Razors on a medium poor viewing day I was able to easily see mottling on the back of a Coopers Hawk at around 250 yards.Con: Shallow field of focus.Overall: Best binoculars I've ever owned.What do I mean by fussy? As a not terribly experienced birder, I need help to "get on" birds that are often moving rapidly around tree branches or flying.-- Eye Relief needs to be adequate so I'm not thinking about exactly where to hold the binoculars in the heat of the moment. I wear medium size glasses and the 10x50 Razor has just enough eye relief to pass this test. I occasionally bump up against eye relief issues, less and less the more I use the Razors. If you wear small glasses, this may not be an issue for you. If you wear large glasses, this may be more of an issue for you.---- In comparison, I never had an eye relief issue with my Viper's.---- I wanted the 12x50 Razor for the extra magnification, but after much Internet research, decided I couldn't give up that extra bit of eye relief and in use I find that was a good decision.-- Exit Pupil is more than I need, but it's very helpful to have more than I need for rapid bird acquisition, again, the binoculars don't have to be perfectly aligned to my eyes if the pools of light coming out of the binoculars are bigger than my pupil.-- Focus knob on both the Razor and Viper is smooth and easy to turn.-- Shallow field of focus - it is shallow, but since I didn't want to spend multiple thousands, I knew I would have to give up something. I don't mind fiddling with that one thing.I've owned a bunch of binoculars and the Vipers were by far the best of the bunch before the Razor. Prices for both were all over the place. Third place is some smaller Eagle Optics binoculars I bought over 20 years ago, very good clarity at shorter range, but the eye relief was so finicky I didn't use them much. The prices I paid reflect my my experience, Razors most expensive, then Vipers, then the Eagle Optics and all the rest below that, with some old huge heavy Nikon 10x50's taking the lead in the "cheap" binocular category.