I have been a member of BNI for 3 years. During the time I have been involved with BNI my business has grown by over 30%. My most memorable referral came from another BNI member in Toledo, Ohio. That call paid for my membership for 2+ years.
The growth is minor compared to the other benefits that BNI offers. The relationships that I have developed through BNI are the biggest benefit. I like comfort of working with people that I know, like and trust.