I am glad the PST is working out for you, but like it or not, the PST line is a very nice budget scope, the upper end of low end. This is not necessarily a bad thing, it just is. Vortex has an incredible marketing division, but in the end, they sacrifice glass and build quality, relying and fancy tactical doodads that sell scopes.
They do have a good warranty, without a doubt. This in and of itself means nothing other than it is cheaper for them to replace their optics than fix them. Leupold has just as good a warranty, they just dont hang their hat on it, and use it as a selling point. Instead, they make a quality optic that rarely needs service, and in the case it does, they handle business.
In all reality, the Nightforce is a mid grade scope, when the likes of Hensoldt, Schidt, and few other European manufacturers are considered. In the scope world, as you climb the ladder, incremental improvements cost exponentially more as you climb the ladder. Every person must choose a point on that ladder where there needs are met.