I was in BNI for 3 or 4 years, and am now in a competing group and have been for 4 years. I have had very favorable results. However, I believed that you that to have the right attitute about it. First, if you will not give it a year, do not waste your time. Groups like BNI are based on relationships. If you do not build the relationships, you will not get the business. If you just show up and expect everyone to give you business you are mistaken.
Pick a group with lender and Realtor with a good reputation. I have had a bad realtor in my groups a couple times, and it just kills me.
When doing your 60 second commercial, ask for the business...think out side the box. I only do residential appriasing, but have 8 to 10 different things that I talk about or ask for.
I have received several non-lending assignments that I never would have if I did not ask. Rental research, consultation, divorce, estate, feasibility of additions, vacant land and pre-listing appraisals are all assignments that I have for the group.
To really capitalize on the group, try asking "Who do you know who works at ....." This a great was to get your foot into a bank, mortgage company, government agency. I never quit being amazed who knows who that I did not know. If you can arrange an introduction, even better.
Once again it is all about relationships. Meet with everyone in your group out side of the meeting. Learn about their buisness. Remember, you are there to help others build their business as much as build your own. The "Givers Gain" philosiphy does work.