I did the Marin event in '07 with TnT. It was the best $1800 experience as far as cycling goes for me. The training they provided helped me keep up with the club folks and it was the driving force I needed to get my butt on a bike for long distance riding. Without their training, I'd never have been able to a metric, let alone a century. Too bad I didn't keep it up though.
By the way, I told my non-cycling buddies that if they wanted to find a date, go join TnT. Lots of fitness minded women in my TnT group, the ratio was like 3 ladies to 1 guy and most of us dudes were married while the girls were single!