the optics are excellent but the eyepiece adjustment for eyeglasses fell off almost as soon as I used these. We also bought a 10x40 pair and they had the same problem within two weeks of use. We had older nikon monarch binocs we bought in 2006 and they were great but were stolen and these were their replacement. I think there is a quality controll problem here and I wonder how well these will hold up long term.
This review was written in the old system and had content requirements that are different than reviews written today.