I've only had one mff experience, long before i came across UKP. A total waste of time for me but pretty much my own fault. The biggest difference between a 3-sum and a 1-2-1 is the same difference between a potentially personal relationship for the punt duration, and a group situation with the almost infinite dynamics going on between them. Its said that in a 1-2-1 (talking about 'normal' life here), there are at least 6 ppl subconsciously involved; 2 parents for each person + the person themselves. In a 3-sum, 9 ppl, and so on. Have to say, i cannot relax and enjoy most group situations, i only see the superficiality and not the potentially healthy ok'ness of a group. Thats just me, of course. Actually, just while writing this I'm beginning to think about it having another mff for myself!