Look for client reviews and press coverage from various sources, and a good company will provide this to you.

FORBES: How To Book A Villa

One high-tech client has claimed that the rate Marsh got it for directors and officers insurance in 2003 was 45% higher than the client would have paid for identical coverage from the same provider-had it used a rival broker.

FORBES: Pulling the Plug on Marsh

Ms. Loeb helped a client who discovered that his elderly mother, who had been admitted to the hospital, had no prescription-drug coverage.

WSJ: Conquering Retirement: A New Medicare Strategy