I've had some warranty experience with 3 optics companies, Burris, Leupold and Swarovski.
Burris Fullfield 3-9x40 rifle scope, bought new, sent in after first sight-in after the reticle was knocked loose, repaired at no cost. I had to send the same scope in again about 1.5 years later for the same issue, repaired again, but I'm done with Burris. I appreciate the lifetime warranty, but don't appreciate having to use it.
Leupold 10x42 Pinnacle binos, sent them in after 3(?) years of use to have the eye cups replaced because they wouldn't stay up during use, received a brand new pair when they were returned.
Swarovski 10x42 EL binos, bought these used on eBay, knowing that they had a shattered right eye piece lens. I was honestly not concerned at all with their condition knowing Swarovski's warranty reputation. When I received them, it appeared that the only damage was the eyepiece, but they smelled as though they had been stored in the bottom of a heavily used ashtray for years. Contacted Swarovski, inquired about repair and was told labor will cost you nothing, we will inspect them and contact you with recommendations. I received a call from them 2 or 3 weeks later and they stated that other than the broken eyepiece, no significant issues were found. They recommended that I replace all of the lenses, and that I would basically have a brand new pair of binoculars. I agreed and for less than $300 out of pocket, I had "brand new" binos. When I received them, I was pleased to discover that they had put a new rubber skin on them and they now looked and smelled new.
I have no experience with Vortex, Athlon, Tract, etc. and don't ever plan to, but as others have said, I believe that with their products, it's not a matter of if you'll use their warranty, but when. I'd rather pay for a more trusted (expensive) brand and lower the risk of having to utilize a warranty.