I had a Walther P22, it was good. Bersa makes good guns from what I hear, magazines would be harder to find, never seen one in store. Walther is subbed by S&W I believe.
If I had to do it over again, I try the Bersa or Ruger Mark III, the Walther has very small grips for XS/S woman hands/childs, it fit me fine with my girly hands. If you have big hands this isn't the gun for you.
I don't like the safety on the Walther, you could still pull the trigger and the hammer slams on the backside w/safety cap out which stops it from striking firing pin.