In the Vortex line, the Razor is tops for optical quality and I love mine. I also have the Viper PST and the glass is not quite as good, but the second focal plane reticle, smaller physical size, and the lower price makes it a more attractive package for most shooters. Most features are similar too, like the customizeable rotational stop, illuminated reticle, four inch eye relief, 65 moa of adjustment, mil/mil or moa/moa, and side focus knob make the PST a great scope for less than $900. In fact I find myself using the PST a lot more than the Razor!