Is this the correct way?

Hi, is this he correct way to change a shader and texture of a model from one to another in runtime, or is there a more efficient way of doing it?

 var shader1 : Shader;
 var shader2 : Shader;
 var material1 : Material;
 var material2 : Material;
 var material3 : Material;
 var testbot : GameObject;
 var testGun : GameObject;
 
 function Start () {
 
     shader1 = Shader.Find("Mobile/VertexLit");
     shader2 = Shader.Find("Mobile/Diffuse");
 }
 
 function Update () {
 
     if (Input.GetButtonDown("Jump")) {
         if( testbot.renderer.material.shader == shader1 ){
             testbot.renderer.material.shader = shader2;
             testbot.renderer.material = material2;
 
             testGun.renderer.material.shader = shader2;
             testGun.renderer.material = material2;
         }else{
             testbot.renderer.material.shader = shader1;
             testbot.renderer.material = material1;
 
             testGun.renderer.material.shader = shader1;
             testGun.renderer.material = material3;
         }
     }
 }