I successfully used WW online to lose almost 40 lbs. I have gained back about 5 but am getting back on track before too much damage has been done.

There are benefits to the groups- but it is a big time commitment and more money. We have a group on the WW forums (on the fitness challenge, "Biking Babes and Guys" that acts as a good motivator. (Maillotpois occasionally checks in there).