I was in a small one once, putting in $500/monthly among 12 women.
Was the most stressful thing of my life. I asked for my month to be November (birthday month) and what was the point? All year I was paying in $500, only to cash out my own savings in November (minus $500 that I needed to pay the last lady in December anyways)...
I am very happy with a savings account, and zero stress.

Is it just a lending thing? Because clearly the other members don't need it if they are able to contribute monthly...
Are you in one? Have been in one?