Has anyone have this optic, Vortex Viper 6.5-20x 50mm? http://www.midwayusa.com/product/72...de-focus-mil-dot-reticle-matte?cm_vc=wishList Any pros and cons of it? This will be my 2nd optic, will be put on my new toy Remington 700 SPS Tac 223. The rifle itself will be my first bolt action. Thank you for suggestions.