I'm another Bersa fan. My first pistol, in preparation for getting my carry license, was the Bersa Firestorm Mini .40S&W. It's the same pistol as the pre-Pro Thunder Ultra Compact, with some cosmetic differences. No 'break-in was required. I shot about two mag loads (20 rounds) to get the 'feel', then 50 rds. to qualify for my CHL, without a hitch.
I will say that the recoil is snappier than my .45 & I would have bought the .45 if I had been able to find one at the time.