On the rifle deer hunt, my 9 year old son's pair of Diamondbacks finally got to a point that they were unworkable. The diopter focus ring had been getting harder and harder to move over the last couple years and this year was so stiff you couldn't adjust it by hand. It had some other cosmetic and eyecup glue issues as well that can happen after 5+ years of use.
I called Vortex and spent less than 5 minutes on the phone and they sent me a shipping label to my email address. I boxed them up and sent them in and in just about 2 weeks had a brand new pair of Diamondbacks delivered. They were unable to fix the issues with the old pair.
I was amazed. There were no questions asked, no fuss. And as it should be, no cost. From my understanding, the older versions of the Diamondbacks have been through an iteration and are supposedly better, so it could be that I have a better binocular. I'm not a Vortex stan and have a wide variety of glass in binoculars, scopes and spotters, but they really impressed me with their customer service and warranty. It's a model I think all companies should follow in the industry.