The V4s are excellent scopes. They are made by LOW in Japan. Optically they are very good at that price point. The VX5 has better eye relief and weight. If you can get a deal on a V4 it will compete very well against a VX5HD and easily beat a Viper in quality.A guy told me today put little more money with it. And get the Leopold vx5 HD 4.5x14x40 Side Focus CDS-ZL scope. Guy show me a zeiss C4 4x16x44mm. Cant remember its exact number. It had been put on a gun. And he didnt like it. He wanted a different scope.