I've had a 4-16x50 FFP PST for about two years and a 2.5-10x44 PST for 1.5-2yrs.
I've had to send the 4-16x50 back twice- once for the reticle rotating when turning the power up/down and the illumination would turn on when it was supposed to be off (e.g. the knob would be between 1 and 2 yet the reticle would be lit up as if on the 10 setting). Both times I had the scope back within a week. CS is top notch at Vortex. I haven't had any issues with the 2.5-10x44.
Glass is good on the 4-16x50 and decent on the 2.5-10x44. If you're interested in the 2.5-10, I strongly suggest going with the 2.5-10x32. Supposedly the x32 has much better glass than the x44. That being said, I've never missed a shot due to the glass quality.
Both scopes track well after spending time on various rifles from a 10/22, CZ452, AR15, and DTA SRS (took the 2.5-10x44 to Africa). And I've done some cranking on them getting from a 50yd 22lr zero out to 200yds and back.
Turrets are good, not great. The clicks are distinct but a little mushy. I really wish they had a high-speed version as the 12moa per turn thing can get a bit old. I haven't felt any other scopes in the PST price range with any better clicks. Honestly though I think my bitching about this is based on my being spoiled with NF and S&B turrets.
I use the EBR-1 reticles and honestly would prefer them to be a bit thinner. This is personal preference, but with the 4-16x50 on high, the reticle covers up too much of the target for my tastes. For comparison the 4-16x50 PST reticle is .21moa thick. The P4F is ~.13moa. I definitely prefer the S&B thickness.
The PST line offers a good set of features (reticle choices, illumination, side parallax control, zero stop-via shims, exposed turrets, etc.) for a very good price. It's an excellent option to get familiar with ranging, holds, etc. before bumping up as budget allows. If you can swing a NF, I'd suggest it, but to get a comparable set of features, you're going to be looking at 1.5x-2x the cost.