Many mfr's today offer their version of a "lifetime" warranty; however, something else that is just as important is how will that company treat you when/if you have to use that warranty. Sometimes companies that are really big give the runaround to the customer trying to get help. Vortex really changed the industry with their VIP program and soon many others were offering similar, but few can match the Vortex VIP experience. I have a ZCO and have not had to use their warranty service; however, I've talked with Nick and Jeff and have no doubt that they would take care of me and fast. And that is the other factor of warranty, are you a competitive shooter or drop your scope on a rock while sighting in for the hunt of a lifetime in two weeks... which company is most likely to get your scope fixed or replaced in that time-frame and I fear many of them will not, but Vortex, ZCO, Schmidt have a good reputation for fast turn around time; are there horror stories, yes, probably every manufacturer has some, but look at the overall treatment of the customer through the process, to me that says a lot.