It's quite difficult to determine the actual skill and effectiveness of a dentist or doctor, and I can only write a review based on "chairside manner", steadiness of hands, apparent thoroughness, communication, mood, etc.
That said, all the Drs. Berger are among the best. I just had a visit for crown replacement prep with Dr. Arnold Berger and (darn it - forgot assistant's name), and in my opinion they were both ideal. As well, my wife says they are very good.
We are both old folks who have seen about a bazillion dentists over the years.