I joined a similar group a couple years ago and bartered my way in, turns out they needed a banner for their open house night. But anyway, the group I was in was not large enough to really justify the time I spent at the meetings (they were held at lunch hour every Wed.)..... and the meetings always conflicted with my schedule. There were only like 10 members of the group.
The only conflict that I had with this group is that there are members from many different trades, caterer, realtor, insurance guy, attorney, etc and I had a hard time sending them leads when I already had good customers in these trades that I would send the referrals to first.
For instance, I have a long-time customer who runs a huge catering business. He is a great customer, and anytime someone needs a caterer, I will send them to HIM. But in the referrals group, there is another caterer.
All in all, I think the groups are great and worth every penny of the dues you pay. Networking is one of the main ingredients to your businesses success, and that is what these groups are for. What have you got to lose????