Vega,
Because the PPK/S (and all PP's, I'm told) recoil straight back instead of the more usual muzzle rise, the pistol causes some pain the web of your hand in between the thumb and the forefinger, particularly after 50 rounds or so. This is far more noticeable in the .380 than the .32.
Having only shot the PPK/S, I didn't know if the Bersa (or any of the clones, for that matter) shared the same problem.