Hey Tex,
I don't own a P-90, but if I did I would expect the same kind of performance I have gotten from other Ruger products. Reasonable accuracy, and absolute reliability in a well engineered package. Although large for the caliber, and not especially pleasing to the eye, not to mention the terrible trigger pull, the centerfire autos are a hell of a deal in a no frills pistol!! I have a friend who worked for an agency that issued P-90s. He said they didn't have any problem with them at the range.
Which is what you'd expect from Ruger.
Stay Safe,
Savage