Agree with J K, the FSB is a far better organisation, with a lot more to offer, no, pressure, good discount and legal deals, etc.
Another option, might be your local Chamber of Commerce, you should get referrals and strong business contacts there.
What I found with BNI, was, it seemed to be populated with a pretty diverse group who were not very good at marketing their businesses and were hoping to do so, to a captive audience.
Cynical ?
Ironically................I was introduced, by an accountant, we had recently moved to and he ended up costing us money through negligence.