Been and joined my local BNI a while ago.
I did OK out of it, people were intersting and I got into quite a few houses to do and on the back of that got to do there offices out of it.
As above there are a lot of 'white collar' businesses there who are working from home. So they might not be your ideal customer base.
I did OK out of it and still get some now and again from people I met there.
I am going to one on Friday morning but it was started by people that got fed up with BNI and they only charge £15.00 for a brekky and use of the room in a hotel, I have got there work out of, going to be about 40 people there.
Most networking groups only let 1 of a trade or business so there is 1 accountant, 1 office cleaner, tax advisor, stationer etc etc so you dont have people fighting over jobs etc.
Like anything in life you get out of it what you put in. Good luck with it
Murky