I've joined for the third time 
Group 1- leader had far too many people so it was all very rushed. Group was massive and as such it was very impersonal. I hated staying to group as it was just a tick list of who had gained and lost, no time for real encouragement/celebration or advice. Was a rather cold experience to be honest.
Group 2 - tiny group! Only 10 of us. Lovely as we had time to share actual tips that were useful! Nice bubbly leader but she left suddenly.
Group 3 - only been to one session but members kept mentioning how it was the best group they had been to because other groups were "clicky". They felt this group really was like a family. Medium size, leader seems nice.
It didn't feel any better than the other groups I've been to though...I don't particularly need a "family" though so maybe that's why.
So what's your experience??