I would guess you haven't used them if thats what you think. I have owned them all. Those are the ones the PX4 most closely compares with. The glass in PX4 is not particularly good. Really nothing about it was particularly good. It was ok for price when they dumped them for cheap.
No on the Burris. Yes on the PST.
Maybe your PX4 was a dog. Mine compares well against a Razor Gen2 which I have used.