You guys that have had problems with the PST's, were they gen 1's or gen 2's?
I had 2 Gen 1 Viper scopes that degraded over time in both tracking and their ability to return to zero.
I have a viper 6x24 that will be going bye bye. Glass quality is meh on this scope and I've had issues with tracking. I thought I was being sly and saving money when I bought it, should have just purchased once, cried once type of deal. Live and learn, but personally I would never buy one again. I would go with a Leupold flavored something with the CDS setup for that price range.
Research those CDS scopes before you replace a vortex with a leupold....