Here's a good indicator that no one else is going to mention. If you see a framed picture with the phrase "Voted Best by...." walk out of the office. I get mailers all the time for these stupid a$$ marketing gimmicks. If a doctor has to buy a plaque for $150 to try and prove they are good at something, who are they fooling. I hope that my patients appreciate the efforts that I take on improving my skills by being a member of study clubs and organizations that strive for professional and personal growth. If all else fails, always go by what your gut sense tells you. This is the same as bying CF parts for your NSX; Would you rather buy from an established brick and mortar store like S.O.S, or take a risk and buy something cheaper from Lithuania?
Good luck.