I belong to a VERY informal one. Most laid back group of quilters I've met since I started this. Nothing formal, "meetings" are during lunch, and calling them meetings is a stretch. We are going on a retreat in May (I think I'm going, sure hope I can get away from here to do it) and I just love them.
There are some guilds close by that I'm not sure I want to be part of. But there are some others that have more appeal to me.
Just my 2 cents.