Compared to the 10x25 Ultravid, which is a solid jewel of engineering, they are much inferior. The optics are not as good (contrast, edge correction), eye relief though specced the same is not as good, inferior ergonomics: the double hinge is fiddly because it lacks the positive stops of the Ultravid, hinge tension lower than in Ultravid, doesn't allow easy wrap-around grip because of hinge design, focus position and operation is awkward, close focus is much inferior, not designed to take a proper neck strap, feels like flimsy glued-together cheap plastic with awkward to use fold down eyecups if that matters. They are my least favorite Zeiss bin, can you tell?
--AP