I participate in the Spark Live meetings and am happy to share a little about why I love them. I started attending the Live meetings when they first began. I was a participant for about 6 months and then was offered a chance to become one of the leaders, which is what I currently do.
The main thing to me is all the motivation that I get (and hopefully provide) in the meetings.
Each week, a different health-related topic is covered. Not only is the topic interesting and informative; but, there is also plenty to learn from the members. I really enjoy hearing how everyone is doing on working towards their goals (weight loss and other goals); the entire group can provide support and encouragement when needed. And we celebrate everyone's successes with some big WooHoos.
There are always ideas shared to help others that may be encountering some issue with their journey...stopping a plateau, ideas to get started with exercise, new healthy foods to try, where to find reasonably priced workout clothes, how to deal with non-supportive family members, ways to sneak in small bursts of exercise, how to deal with snack attacks, etc.
I've also found that we're forming new Spark friendships that continue to provide motivation and support outside of the meetings themselves.
If you haven't read the SP description of the meetings, you might want to check out this page: www.sparkpeople.com/myspark/live.asp
If I can answer more questions about SP Live, just let me know. I really do encourage you to give the free trial a chance. You might just find that you get as much out of these meetings as I do. :-)