Vortex Diamondback riflescopes have been the leading basic product from the Vortex Company, until the arrival of more advanced Vortex Viper riflescopes. They have obtained excellent reputation because of their robustness proven by the most powerful magnum rifles and low temperatures and wet conditions. Video clips can be found on Youtube where this riflescopes have been submerged into water for 24 hours, then had them frozen at extremely low temperatures and then finally being used on the most powerful African hunting calibres. Vortex Diamondback has passed all these extreme tests with flying colours which is hard to believe given the price range they are in. Such robust housing, quality optics, argon filled inner structures, which prevent dew accumulation at low temperatures, and such reliability is very hard to find for such a price. Add in the lifetime warranty then it becomes clear that Vortex Diamondback riflescopes are almost mandatory buy.