I love BzzAgent...I really do. I think work of mouth marketing is THE way to go. I prefer to try new products that people I know (even if it is just a blogger I "know") have tried. If I like a person's style I am likely to find their opinion to be spot on with my own.
I recently jointed a BzzCampaign for Smarterer...essentially a quiz website. It was fun the first time I took the quiz but that was about all. I think I'm too old to care what my status is for taking quizzes... but I could see others enjoying this.
For now- I will relinquish my top-tier status as BzzAgent Smarterer and waste my time in other ways...like reading blogs about awesome natural products or checking status updates on Facebook.