Social Circles is an activity club, not a dating service, so it provides a great way to meet other fun, active singles without the stigma or uncomfortable expectations of being on a date. Everyone is so friendly! I've formed many solid friendships and dated some wonderful women, and the best news is that I am now engaged to a fellow SC member. Friends rarely share all our interests, or are too busy, and SC exists for people who want active social lives. Granted, membership isn't cheap, but it is not as high as some people are quoting and it keeps out the riffraff (i.e., the people you see complaining on this message board!). I met my fiancee, so obviously, the fee was worth every penny, and we are just one of the many couples who are now engaged or married thanks to SC!
Pros: meet without pressure, fun things to do, met my fiancee!