Only viable knock on them is durability/longevity of small parts, so if you're shooting thousands of rounds, get something more expensive like a Sig, Kahr, 1911, CZ, BHP, or whathaveyou.
The Bersa's are rising in popularity. The quality is great for the price and I've heard that the customer service is equally as good. I've shot the 9mm and 45. Loved em both and fairly accurate for compacts. I wouldn't hesitate to lay the cash down on one.