I had a stainless Interarms PPK/S back in the nineties. Carried it as a BU/OD gun. Great shooter, and well-fit together. Quite accurate; I qualified better with it once than with my primary duty weapon (Ruger P-85 at that time.)
It did have some snap to it, but nothing out of line for me. As was mentioned, there is no slide-lock, either manual, or "last-shot."
It pocket-carried well. compared to other choices of the day. Such would be different today.
I sold it after leaving LE, during some hard times. Missed it when I returned to the firearms scene nearly 20 years later. Bought a Bersa Thunder as a replacement. Not quite as slim or small, and not quite as pretty, but for me, a better gun. It's lighter, has a smoother trigger, holds one more round than that PPK/S did (I think the current ones match the Bersa in round capacity), and was just a tick over half the price of a new PPK/S.