Ok... I'm going to break eggs here. The fact is that anyone that spends $1800+ dollars on a scope is going to defend the hell out of it when some joker suggests or outright says that his $1000 scope is just as good or better. The fact is that some scopes form and function exceed their price point, and some do not.
I've looked through an Nsx to compare it to a Vortex Razor I purchased and to be quite candid, there was very little difference if any at all. Both were super clear and I didn't have the evening post on a target at 1000 yards so I couldn't differentiate any discernible difference in optical clarity.
That being said... I sold my Razor and bought a viper pst ffp 6-24x50 mrad and I couldn't be happier. The glass is far better than decent. Reticle is outstanding. Adjustments are tactile and spot on. Now was it better than the razor with respect to optical clarity? Not sure... Sold the one to buy the other, but I can say that I haven't regretted the decision for one nanosecond since I made the decision.
The reason... the razor as well as the Nsx are built like tanks. I think you could beat them over a grizzly's head til it bled out and it'd be no worse for wear, BUT, and this is huge to me, all that durability comes with a weight cost. I plan to actually go out into the field and hunt. I plan on hiking up slopes and down the other side and both the nxs and razor feel like I've got a fat *** rock chuck hitching a ride on my receiver.
I traded down to the PST and the weight is perfectly balanced between what I consider durable and usable. Doesn't feel cheap, but doesn't feel like I'm carrying around an extra brick. I don't feel like I sacrificed anything and I'm very happy with the scope overall. If someone gave me an Nsx or razor, I'd sell them, get another pst and use the extra cash for a stock upgrade or grab some more brass and powder.
Now to each his own, but if you got a viper pst ffp and the glass looks bad... You got a lemon obviously. Send it in, but if you're implying that all pst glass is crap, I will stand up and beg to differ. I've always loved the bushnell elite glass, especially the 4200, and I have a closet full of them, but after getting the Vortex Viper and using it, well... I said it in other post... I think it's the only glass I'll be buying down the road.
I'm not some Vortex Viper supporter. I don't care who makes it, who else has it, or if it's the darling of the shooting community or not. What I do care about is that what I buy does what I need it to repeatedly and reliably. If it doesn't, I get rid of it. If it does, well... I keep it. The pst is a keeper in my book.