Glad to see this new section.
I prev owned a Five-Seven, and I still have a PS90.
I sold the Five Seven to help pay for a Custom 1911. It was a cool gun, but I don't miss it. I never could get it to shoot as accurately on paper as I could other guns. I've seen others report the same issues.
Granted, I could hit the target, just not the center of it all the time. There seems to be some variation in the POI. I also read a magazine article recently, and the writer commented on the way rounds would form a string or a line. He thought itw as odd too.
But, I do not have that issue with my PS90, and I love that gun!